Public Administration (U.S.) — NAICS 92

A Histometrics rollup primer for public-market and private investors. The North American Industry Classification System (NAICS) is the U.S. government's standard scheme for grouping the economy into industries. Sector 92, Public Administration, is the two-digit level — the top of one branch of the tree — and it covers government itself: the offices that lead, tax, borrow, regulate, judge, house, protect, explore, and defend, at the federal, state, local, and tribal levels. This page synthesizes across its eight child subsectors — how they differ in size, direction, ownership, and how you touch them — and treats the sector as a whole. For company-by-company detail, follow the child links.

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1. Overview

Sector 92 is not an industry you can buy — it is the machinery of American government sorted into eight functional buckets.[1] Every establishment inside it is a tax-funded public office: no shares, no receipts, no profit margin, no takeover value. That single fact governs everything below and is the most important thing an investor can know about the sector.

Investors reach this world only indirectly, and there are exactly three doors, each of which recurs in every child:

1. Lend to the governments — municipal ("muni") bonds and U.S. Treasuries, the debt that funds the machine.
2. Own the vendors — the government-technology ("govtech") software, government-services, and engineering firms the agencies pay to run the work.
3. Own the assets they regulate or contract for — regulated utilities, defense primes, private-prison operators, tribal-gaming enterprises, housing finance.

The distinctive job of this rollup is the contrast across the eight: they range from a ~$1-trillion-a-year defense budget to a ~$24-billion space agency, from functions with genuine listed operators (corrections, defense) to functions with essentially no public play (diplomacy, planning). An allocator who "buys Sector 92" is really assembling a basket of muni bonds, a handful of recurring govtech and services names, a slug of regulated utilities and defense primes, and a few specialty operators — and must be careful, because the same names appear under several children at once.

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2. What's inside — the eight subsectors and how they differ

Sector 92 splits into eight three-digit subsectors.[1] Notably, seven of the eight contain a single four-digit child of the same name, so each is effectively a pass-through to its one industry group; only 921 fans out into six five-digit lines. The real variety is across the eight, and it is large. The table below is the heart of this primer.

A caution on "share of the level": because government activity has no revenue denominator (Section 3), no clean percentage split exists. The "relative size" column gives a labeled proxy — budget dollars stewarded and/or employment — not a receipts share.

Reading across the rows, four contrasts stand out:

• By dollars, defense (928) and the public-finance/tax machine inside 921 dominate; by program dollars administered, human-resource programs (923) are largest of all (Social Security alone is ~$1.47T). By core headcount, defense (928) and justice/public safety (922) are the giants. By listed-investment opportunity, 928 (defense), 926 (utilities), and the public-finance slice of 921 offer the deepest menus.
• Only two functions let you own something close to the government activity itself — corrections (via for-profit operators paid a per-diem) inside 922, and, more loosely, defense procurement inside 928. Everywhere else you own vendors, bonds, or regulated assets standing around the function.
• Direction of travel diverges sharply. Defense, utilities regulation, income support, and the muni-fee complex are expanding or durable; education, public health, environmental agencies, and foreign aid are in active 2025-26 retrenchment; space's government core is flat while its commercial edge accelerates.
• Ownership mix runs the full spectrum — from listed near-monopolies (ratings, exchanges, private prisons) to PE-owned services roll-ups (Guidehouse, Gainwell, ManTech) to bond and tax-credit institutions to unbuyable privates (elections vendors, SpaceX, aid non-profits).

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3. Size of the sector (rollup figures + undercount caveat)

Ground-truth caveat, stated first. Our ingested federal-statistics file for NAICS 92 contains no metrics — it is empty by design.[1] So this page reports no Histometrics ground-truth figure for the sector; every number is a cited public-source figure carried up from a child primer and labeled as such. We invent nothing and never state a suppressed value.

The reason is structural and is the single most important measurement fact about this sector: the Census Bureau's business datasets — the Economic Census, County Business Patterns (CBP), and Statistics of U.S. Businesses (SUSB) — exclude Sector 92, Public Administration, by design, because they count private employers, not governments.[2] So the "firms / receipts / payroll" tables that anchor most Histometrics primers are effectively null across the entire sector. Government activity is measured instead by three other yardsticks — the Census of Governments, the Bureau of Labor Statistics' Quarterly Census of Employment and Wages (QCEW), and agency budgets — and even those cover the eight children unevenly.

What the alternative sources show, in three registers:

• As a set of organizations, it is vast and fragmented. The 2022 Census of Governments counted 90,837 governments — one federal, 50 states, 3,031 counties, 35,705 municipal/township governments, and 39,555 special-purpose districts — each a jurisdictional monopoly with no entry, exit, or price competition.[3]
• As an employer, it is one of the largest slices of the economy — several million people. Clean QCEW floors surface unevenly: ~670,000 jobs across two of six lines in 921[4], ~419,000 in one of four lines in 923[4], ~523,000 across three of five lines in 926[4], ~127,000 as coded in 924[4]; justice and public safety (922) alone spans on the order of a million law-enforcement and a million fire-service workers plus ~388,000 correctional officers, and defense (928) adds ~1.3 million active-duty military and ~700,000-800,000 civilians. These are non-additive — different surveys, different vintages, different scopes — so we state them as floors, not a sector total.
• As a steward of capital, it dwarfs any private industry. Federal gross tax collection was ~$5.1 trillion in FY2024[5]; state and local tax collection ~$2.095 trillion[6]; national-defense budget authority ~$1.01 trillion[10]; Social Security benefits ~$1.47 trillion[11]; the muni-bond market ~$4 trillion[7] and public-employee pension assets ~$5.13 trillion[8]. Measured by money raised, allocated, and defended, Sector 92 is the largest activity in the economy — it simply registers as government spending, not as commercial revenue.

Undercount caveat. The undercount here is total, not marginal: standard business statistics capture none of the government activity in this sector. It is worst where small or unpaid officeholders dominate (tens of thousands of local legislators and board members never surface in a payroll survey), where the workforce is largely volunteer (roughly two-thirds of firefighters), and where the true footprint is booked under other codes (most public-conservation staff sit in land agencies coded outside 924; tribal economic weight sits in gaming codes; the space workforce is scattered across manufacturing and R&D). Any commercial "market size" for these codes is really a government-spending figure, not vendor revenue you can earn on.

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4. Investable universe (where value concentrates across the eight)

Because every code is government, the entire investable universe is adjacent — and it is not spread evenly. Value pools in a handful of places, and, critically, the same pools thread through several children:

• The muni-bond complex (shared, largest, most liquid). The ~$4-trillion municipal market and its fee ecosystem — the credit-ratings near-duopoly (Moody's, S&P, with Fitch third), bond insurers, underwriters, and advisors — is the richest ownable franchise in the sector. It is threaded through 921 (general government finance), 924 (water/sewer revenue bonds), and 925 (housing, redevelopment, and tax-increment bonds). Do not stack it — it is one asset class, not one per child.
• The recurring vendor roster (shared across children). A small set of names proxies multiple subsectors at once: Tyler Technologies (courts, public safety, general govtech), Maximus (human-services, health, VA, student loans), Booz Allen Hamilton, Leidos, Accenture, Conduent, SAIC, CGI (federal systems and services across 921, 923, 926, 928). Buying them is one bet on "sell software and services to government," not eight. Do not stack them either.
• Regulated and served assets (deep, listed). Regulated electric/gas/water utilities and the derivatives exchanges (CME, ICE) sit under economic-programs regulation (926); the defense industrial base — primes plus a services/IT tier — sits under national security (928); the waste oligopoly, water utilities, and environmental-engineering roll-ups (Tetra Tech, Jacobs, AECOM, Stantec, WSP) sit under environmental quality (924).
• The rare direct operators. Private-prison and detention operators CoreCivic and GEO Group (together >70% of private beds) under 922, and public-safety hardware/software leaders Axon and Motorola Solutions, are the closest thing to owning a public-safety function.
• Specialty and thinner pools. Tribal-gaming exposure via casino managers and gaming REITs (VICI, Gaming and Leisure Properties) and high-yield tribal-enterprise debt (921); housing finance via Ginnie Mae mortgage-backed securities, housing-agency bonds, LIHTC funds, and the GSEs Fannie Mae/Freddie Mac (925); space via defense/aerospace primes and listed pure-plays (Rocket Lab, AST SpaceMobile), with the marquee names (SpaceX, Blue Origin) still private (927).

The discipline that applies to every name: segment revenue is not sector revenue. Each listed company sells well beyond any one code, several serve multiple children, and the sector itself has no revenue — so sizing it by a contractor's market cap is a category error. Tickers and per-name detail live in the child primers.

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5. How the money works

No office in Sector 92 earns a profit — each manages a budget, not a margin: a chief executive proposes, a legislature appropriates, the office spends within the appropriation, funded by taxes, fees, intergovernmental grants, and borrowing. Government output is valued at cost, not market price. The investor-relevant economics live one step out, in three shapes that recur across all eight children:

• The debt (lend to governments). Municipal bonds — general-obligation (GO) bonds backed by taxing power and revenue bonds backed by a specific stream (tolls, water, hospitals, housing) — plus U.S. Treasuries as the federal equivalent. Most muni interest is exempt from federal income tax, which is why individuals hold roughly two-thirds of the market. Returns are coupon and spread, driven by issuance volume and credit, not headcount.
• The vendors (own the suppliers). Govtech is high-retention subscription software (richest margins); business-process outsourcing (BPO) and services are contract-based and labor-heavy (a headcount × utilization × bill-rate game); engineering is a backlog-and-book-to-bill business. The metrics that matter are funded backlog, book-to-bill, recompete win rates, contract type, and cash conversion. Demand is stable but appropriations-driven — timing tracks the budget cycle, not the business cycle.
• The regulated/served assets (own what the function gates). Here — and only here — do specialized economics apply, and each belongs to exactly one child: rate base × allowed return on equity (ROE) (~9.5-9.7% for U.S. electric utilities) for regulated utilities under 926; people × per-diem × days for private-prison operators under 922; long-cycle procurement and progress/milestone billing for defense primes under 928; guarantee fees and tax-credit spreads for housing finance under 925; exchange transaction-and-clearing fees under 926. Do not force rate-base, REIT funds-from-operations, or mining cost-curve language onto the rest of the sector — it does not apply to a tax-funded office, a services contract, or a muni bond.

The unifying idea: the government is the faucet; returns accrue to whoever stands under it — never to the administrators running it.

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6. Demand drivers

"Demand" means demand for the debt, the vendors, and the served assets. Across all eight children it is set by policy, law, and budgets, not by consumers or the ordinary business cycle:

• The appropriations and budget cycle — the master switch. Continuing resolutions, shutdowns, and reauthorizations gate every vendor's backlog. Tight budgets can cut agency headcount but often increase outsourcing.
• Interest rates — the master variable for the debt door: they set borrowing costs, drive muni prices and refinancing waves, and gate issuance and housing-finance volume.
• Digital modernization and cybersecurity — aging systems drive multi-decade replacement cycles; state, local, and education ("SLED") information-technology (IT) spending topped $143 billion in 2024[19], with federal IT above $100 billion a year, all of it hardened by compliance mandates on sensitive personnel, benefits, tax, health, and elections data.
• Demographics — an aging population lifts Social Security and disability caseloads (923) and turns the fire service into a majority-emergency-medical operation (922).
• Geopolitics and threat perception — strategic competition with China and Russia and a modernization wave pull defense (928) and space (927) up; the same geopolitics leave foreign aid politically exposed.
• Immigration enforcement — the One Big Beautiful Bill Act (OBBBA) made roughly $45 billion available for detention capacity through FY2029, a powerful near-term engine for the private operators (922).[13]
• Climate, disaster, and infrastructure — rising disaster frequency and aging systems drive environmental (924), emergency-management (922), and water/housing (924/925) work; large federal infrastructure funding feeds transportation and utilities (926).
• Artificial intelligence (AI) — two-edged everywhere: it could expand modernization demand while commoditizing labor-heavy processing and basic policy-tracking products.

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7. Regulation

Sector 92 is unusual because the establishments are the regulators — several children (courts, police, utility commissions, environmental agencies, financial-market overseers) exist to write and enforce rules on everyone else. "Regulation" that matters to an investor therefore has two faces, and both recur across the sector:

• The framework governing the functions themselves — constitutional separation of powers, appropriations law, and the state/federal Administrative Procedure Acts; plus function-specific statutes (the Clean Air and Clean Water Acts for 924, the Fair Housing Act for 925, the Indian Gaming Regulatory Act for tribal gaming in 921, the Commodity Exchange Act for 926, the Federal Acquisition Regulation for procurement everywhere).
• The regime governing the two investable doors. For bondholders: municipal-securities disclosure under the U.S. Securities and Exchange Commission (SEC) and the Municipal Securities Rulemaking Board (MSRB), issuer accounting under the Governmental Accounting Standards Board (GASB), and the Internal Revenue Service (IRS) policing the tax exemption that makes munis cheap to issue. For vendors: the Federal Acquisition Regulation (FAR) and its state/local analogs, plus cloud- and data-security regimes — the Federal Risk and Authorization Management Program (FedRAMP)/StateRAMP, the FBI's Criminal Justice Information Services (CJIS) policy, and the Cybersecurity Maturity Model Certification (CMMC) — which are barriers to entry that become moats for compliant incumbents. For served assets: state utility commissions set utility returns (926), the Federal Housing Finance Agency oversees the GSEs (925), and export-control and classified-work rules bind defense and space suppliers (927/928).

The defining recent theme, cutting across the civilian children, is 2025-26 federal retrenchment — efficiency drives and workforce cuts, the move to dismantle the Department of Education, proposed CDC cuts and HHS layoffs, EPA reductions, and the dissolution of the U.S. Agency for International Development (USAID) — which shrinks the federal footprint and leans on uneven state and local budgets. It is the single biggest live policy variable for the sector, and it pushes in the opposite direction from the defense expansion.

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8. Consolidation

The pattern is consistent enough to state as a rule: the government side never consolidates; the private side around it consolidates hard.

• Government is a set of jurisdictional monopolies — each office holds a defined territory or legal monopoly with no competitor to merge with, and the count of ~90,837 governments has been broadly stable.[3] It is deliberately decentralized (~18,000 law-enforcement agencies, ~3,300 local public housing agencies, 50 state utility commissions), which makes selling into it slow but each installed vendor base sticky.
• The private adjacencies consolidate relentlessly. Durable near-oligopolies sit in public finance (the ratings core, two-writer bond insurance), commodities (the CME/ICE exchange duopoly), corrections (GEO + CoreCivic >70% of private beds), and defense (major U.S. primes fell from 51 to 5 by the early 2000s). Active PE-led roll-ups and take-privates run through govtech (Tyler foremost), federal services (Guidehouse/Bain ~$5.3B, ManTech/Carlyle ~$4.2B, Gainwell/Veritas, the Amentum-Jacobs combination), environmental engineering, and the fire-service supply chain. In housing, the parallel move is the privatization of aging public housing (HUD's Rental Assistance Demonstration has converted ~230,000 units into private-ownable structures).[16]

The takeaway: buyers keep concentrating the service and regulated-asset layers even though the regulator itself never changes hands.

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9. Risks

Because the offices are not investable, risk is borne by the counterparties — bondholders, vendors, and owners of the served assets — and several risks cut across all eight children:

• Appropriations and policy risk — the master risk. Elections, budgets, continuing resolutions, shutdowns, and rescissions set the whole sector's spending; a single bill can gut a program (USAID in 2025) or flood another (OBBBA detention money). The largest policy risk tied to the sector is not to any holding within it but the risk that legislative bodies (921) impose on the rest of a portfolio.
• Proxy / basis risk. No listed name is a clean bet on any code — every one has only partial exposure, and several serve multiple children. Isolate the real segment before drawing conclusions.
• Measurement risk. Standard business datasets exclude Sector 92, so no reliable top-down "market size" or "growth rate" exists; anyone sizing these codes from commercial data will misjudge them.
• Customer-concentration, recompete, and procurement risk — the vendors' effective sole customer is government; revenue depends on slow, lumpy, protest-prone cycles.
• Cybersecurity and data-privacy risk — these systems hold enormous troves of personnel, benefits, tax, health, and elections data.
• Tax-policy risk — any cap or repeal of the federal muni exemption would reprice the entire ~$4-trillion muni asset class.
• Leverage and valuation risk — the PE-owned services roll-ups and the private-prison operators carry heavy debt; the cleanest govtech and space names trade at rich multiples; several also face ESG-screen exclusion or civil-liberties backlash.

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10. How to invest & outlook

Direct ownership is impossible and always will be, so all three routes are indirect and — after de-duplicating — surprisingly concentrated:

• Lend to the governments (fixed income): broad muni funds (e.g., MUB, VTEB) and leveraged closed-end muni funds for higher, riskier yield; U.S. Treasuries for the federal equivalent; housing-agency and Ginnie Mae paper for the housing slice; high-yield tribal-enterprise debt for the specialty slice. Muni exposure is one asset class — do not buy it five times.
• Own the vendors (equities): a basket anchored on the shared government-services and govtech primes — Maximus and Tyler above all, plus Booz Allen, Leidos, Accenture, Conduent, and the environmental-engineering roll-ups — held once, not per child. Add the public-finance fee complex (ratings, insurance, underwriting) for the richest franchise.
• Own the regulated/served assets: regulated utilities and the exchange duopoly (926); defense primes, defense-tech, and aerospace-&-defense ETFs (ITA, XAR) plus space pure-plays (927/928); the private-prison operators (922); LIHTC and housing-finance vehicles (925). Private routes run through PE and private-credit ownership of the specialist vendors, direct government contracting, LIHTC equity, and pre-IPO stakes in defense-tech and space.

Valuation belongs at the company level, never the sector level — the offices have no price.

Outlook. Public administration is about as defensive and low-cyclical a demand pool as exists — governments do not stop taxing, judging, regulating, or defending in a recession — but the terms are set by politics, not markets, so policy risk is the price of admission, and the sector is visibly split in direction. Constructive and durable: defense (record ~$1-trillion budgets, bipartisan support), the public-finance fee complex (non-cyclical in existence even as issuance is cyclical, with 2025 a record issuance year), regulated utilities (a capital super-cycle driven by electrification and data-center load), and income support (aging-demographic tailwind). Under pressure: education, public health, environmental agencies, and foreign aid, all in active 2025-26 retrenchment. Accelerating on its own clock: the commercial space ecosystem, even as its government core stays flat. The honest through-line for the whole sector: the question is never "how is the industry priced?" — the offices have no price — but "how creditworthy are these governments, and who are they paying?"

For the full breakdown of each function, see the eight child subsector primers: 921 (Executive, Legislative & General Government Support), 922 (Justice, Public Order & Safety), 923 (Human Resource Programs), 924 (Environmental Quality Programs), 925 (Housing, Urban Planning & Community Development), 926 (Economic Programs), 927 (Space Research & Technology), and 928 (National Security & International Affairs) — and the leaf primers beneath them.

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Sources

This sector rollup synthesizes from its eight child subsector primers (921-928) and this level's ground-truth stats file. Our ingested federal statistics for NAICS 92 record no stat_metrics for this node, so every figure above is a labeled public-source number carried up from a child primer. Full URLs and titles live in the child primers' Sources lists; numbering below is local to this page.

0. Histometrics ingested federal statistics — no stat_metrics entries exist for NAICS 92 (or its eight children at the sector-rollup level); every figure on this page is a cited external benchmark. (Internal ground-truth check, stats-92.md.)
1. U.S. Census Bureau. "2022 NAICS Manual — Sector 92, Public Administration (subsectors 921-928)." 2022. https://www.census.gov/naics/?input=92&year=2022
2. U.S. Census Bureau. "Economic Census 'Understanding NAICS,' County Business Patterns, and Statistics of U.S. Businesses methodology — Sector 92 (Public Administration) and government establishments excluded from business statistics." 2022-2026. https://www.census.gov/programs-surveys/economic-census/year/2022/guidance/understanding-naics.html
3. U.S. Census Bureau. "2022 Census of Governments — Organization (90,837 governments: 3,031 counties, 35,705 municipal/township, 39,555 special districts)." 2023. https://www.census.gov/programs-surveys/cog.html
4. U.S. Bureau of Labor Statistics. "Quarterly Census of Employment and Wages (QCEW) — national data by NAICS government subsectors (partial coverage; employment, establishments, wages, 2024-2025)." 2025-2026. https://www.bls.gov/cew/
5. Internal Revenue Service. "IRS Data Book (FY2024 gross collections ~$5.1 trillion)." 2025. https://www.irs.gov/statistics/irs-budget-and-workforce
6. U.S. Census Bureau. "Quarterly Summary of State & Local Tax Revenue, 2024 (~$2.095 trillion)." 2025. https://www.census.gov/programs-surveys/qtax.html
7. SIFMA. "US Municipal Bonds Statistics (~$4 trillion outstanding)." 2025. https://www.sifma.org/research/statistics/us-municipal-bonds-statistics
8. National Association of State Retirement Administrators. "Public Fund Survey (state & local defined-benefit assets ~$5.13 trillion, FY2024)." 2025. https://www.nasra.org/publicfundsurvey
9. Municipal Securities Rulemaking Board. "2025 Municipal Market Year in Review (~$580 billion issued, record)." 2026. https://www.msrb.org/Market-Data-and-Research/2025-Municipal-Market-Year-Review
10. U.S. Department of Defense, Office of the Under Secretary of Defense (Comptroller). "FY2026 Defense Budget Request (national-defense total ~$1,011.9B; DoD ~$961.6B)." 2025. https://comptroller.defense.gov/Budget-Materials/
11. Social Security Administration. "Fast Facts & Figures About Social Security, 2024 (OASDI benefits ~$1.47 trillion)"; VA FY2025 budget >$400B; NCES public K-12 spending ~$1.0T; KFF public-health funding ~$160B (per the 923 primer). 2024-2025. https://www.ssa.gov/policy/docs/chartbooks/fast_facts/2024/fast_facts24.html
12. Urban Institute. "Criminal Justice Expenditures: Police, Corrections, and Courts (state/local police ~$135B; judicial-and-legal ~$52B; total justice spending ~$305B in 2017)"; Prison Policy Initiative (public corrections ~$115.8B; ~1.9M confined); BEA/NFPA fire (~$79.2B; ~1.0M firefighters). 2024-2026. https://www.urban.org/policy-centers/cross-center-initiatives/state-and-local-finance-initiative
13. American Immigration Council. "Immigration Challenges in Implementing the One Big Beautiful Bill (~$45B ICE detention capacity, FY2025-2029)." 2025. https://www.americanimmigrationcouncil.org/blog/immigration-challenges-implementing-the-one-big-beautiful-bill/
14. NASA. "FY2026 Budget Request (~$24.4B)"; U.S. Bureau of Economic Analysis, "Space Economy Satellite Account (U.S. space gross output ~$240.9B, 2023)." 2025. https://www.nasa.gov/fy-2026-budget-request/; https://apps.bea.gov/scb/issues/2025/03-march/0325-space-economy.htm
15. Congressional Research Service / U.S. EPA. "FY2026 EPA appropriations (regular ~$8.8B; ~$20.8B incl. infrastructure advances)"; CRS, "Federal Land Ownership (~640M acres; ~28% of U.S. land)." 2024-2026. https://www.congress.gov/crs-product/R42346
16. Bipartisan Policy Center. "Final FY2026 THUD Funding Summary (HUD ~$77.3B)"; CohnReznick, "2024 LIHTC Equity Market Volume Survey (~$28.9B)"; U.S. Census Bureau, urban/regional planner counts; HUD/Local Housing Solutions, "Rental Assistance Demonstration (~230,000 units converted)." 2024-2026. https://bipartisanpolicy.org/explainer/appropriations-update-final-fy2026-thud-funding-summary/
17. S&P Global Market Intelligence. "US utility capex forecast (~$215B in 2025); authorized electric ROE ~9.5-9.7%." 2024-2025. https://www.spglobal.com/market-intelligence/en/news-insights/research/2025/10/us-utility-capex-forecast-nudges-higher-on-increased-generation-spending-plans
18. NPR. "USAID officially shuts down and merges remaining operations with State Department," July 1, 2025; KFF, "U.S. Foreign Aid Freeze & Dissolution of USAID: Timeline (Executive Order 14169)." 2025. https://www.npr.org/2025/07/01/nx-s1-5451372/usaid-officially-shuts-down-and-merges-remaining-operations-with-state-department
19. e.Republic / Center for Digital Government. "State and Local Government Market Data (SLED IT-related spending exceeded $143 billion in 2024)." 2024. https://www.erepublic.com/press/center-for-digital-government-releases-state-and-local-government-market-data-and-govtech-radar-for-2024/