Chapter 31 — Key Takeaways

The empirical landscape

The United States has approximately 335 million residents. The foreign-born share is approximately 14.5 percent — historically high and comparable to the early-1900s peak.
Of approximately 48 million foreign-born residents: ~24 million are naturalized citizens, ~13 million are lawful permanent residents, ~5–6 million have other lawful status, and ~11–13 million are unauthorized.
The unauthorized population has been roughly stable since 2008. Most are long-term residents (median tenure ~15 years). Approximately 85 percent are from the Americas. About two-thirds entered legally and overstayed; about one-third entered without authorization. About half live in mixed-status families with US-citizen children.
Border encounters surged 2021–2024 to roughly 2.5 million annually, then declined sharply 2024–2025 with a combination of administrative changes and Mexican cooperation.

US immigration law is built on the Immigration and Nationality Act of 1965, modified extensively but never replaced. The 1986 IRCA and 1996 IIRIRA were the most significant amendments.
Five legal pathways: family-sponsored (~70%), employment-based (~14%), refugee, asylum (no cap, ~3.7M backlog), diversity lottery (~50,000/year).
Per-country caps produce decade-long backlogs for high-demand source countries (India, China, Mexico, Philippines).
Since 2002, immigration is administered by three DHS components: USCIS (services), ICE (interior enforcement), and CBP (border enforcement). Immigration courts are housed in the Department of Justice (EOIR), not in the federal judiciary.

Crime. Immigrants — both documented and undocumented — commit crimes at lower rates than the native-born.
Fiscal effects. Immigrants are net positive contributors at the federal level over their lifetimes; state-and-local fiscal effects are more mixed and partly localized.
Labor markets. Small aggregate wage effects; modest negative effects on similar-skill native-born workers (especially less-educated); positive effects on complementary workers and consumers.
Assimilation. Cross-generational assimilation is robust on language, intermarriage, and civic identification — at rates roughly comparable to early-20th-century European-immigrant patterns.

Restrictionist / pro-borders. Concerns about rule of law, sovereignty, labor-market effects on existing low-income workers, public-services capacity, and absorptive capacity for cultural cohesion. Calls for lower total numbers, stricter enforcement of legality, employer accountability, tighter asylum standards. Borjas, Salam, Krikorian, Levin.
Pro-expansion. Concerns about humanitarianism, economic growth, demographic crisis, innovation, and rule-of-law-via-sensible-paths. Calls for higher legal admissions, broader pathways, expanded refugee admissions, country-cap reform. Caplan, Cato, Nowrasteh, Rodríguez (legal/centrist version).
Comprehensive-reform / centrist. A bargain exchanging meaningful enforcement for meaningful legalization. Has been negotiated repeatedly (2007, 2013, 2024); has not passed since 1986. Niskanen Center, Bipartisan Policy Center, the negotiating senators of various cycles.

The activist base of each party — primary voters, donors, ground-game volunteers — opposes the bargain that centrist legislators are willing to make. Each base has effective veto power within its party's congressional caucus.
The deeper version: the issue benefits each party electorally more in unresolved form than in resolved form. Resolution would deprive each party of a galvanizing motivator.
This is a structural account, not a personal account. Members who personally favor reform face primary challenges from those who do not.
The 2024 Lankford–Sinema–Murphy deal is the clearest documented case: a substantive bipartisan bargain killed not on policy merits but on explicit electoral grounds.

DACA (2012) protected approximately 800,000 individuals from deportation; ~580,000 remain active recipients.
Legal status is precarious: Regents (2020) blocked Trump-1 wind-down on procedural grounds; Texas v. United States (DACA, 2022 onward) holds the program substantively unlawful, with ongoing litigation.
Legislative codification has failed across four administrations and thirteen years despite consistent 70–80 percent public support.

Trump-2 has launched the most aggressive interior-enforcement push since the 1950s. Operational scale is substantial but constrained by ICE capacity (~6,000 deportation officers, ~41,500 detention beds) and the immigration-court backlog (~3.7 million cases).
Birthright citizenship under the Fourteenth Amendment is established by United States v. Wong Kim Ark (1898). The Trump-2 executive order is being challenged; lower courts have blocked it; constitutional consensus across ideological lines holds the order will not survive Supreme Court review.
Due process for removals applies to individuals physically present regardless of status. The scope of expedited removal expansion is in active litigation.
Posse Comitatus limits on military involvement in domestic enforcement are being tested in real time.

Immigration is the most politically fraught policy area in modern US politics. Charity to all sides is essential.
Empirical questions on which the academic literature has converged should be stated as data, not as contested partisan claims.
Both restrictionist and pro-expansion positions, in their strongest forms, are coherent positions held for non-pathological reasons by serious people.
The comprehensive-reform path has failed for structural reasons. Until the underlying electoral incentive changes, the cycle of failed bargains will continue.
Executive action, court rulings, and operational decisions are filling the space the legislature has vacated. The result is policy on weaker legal foundations, more vulnerable to judicial challenge, and dependent on persistent executive priorities.
Read the chapter understanding that immigration is the policy area where the gap between rhetorical positions and operational realities is widest, and where the country has not yet decided what kind of country it wants to be.