United States

Borders, customs and immigration in the United States

One agency at the ports of entry and between them; the immigration function split three ways inside a single department; and, at sea, a service that enforces whichever department’s law it is as that department’s agent.

Fact-checkedSafety review clearedLast updated 18 September 2026Last reviewed 18 September 2026

Facts verified: September 2026

This is a static reference page, not a live feed — check anything you intend to act on with the official source.

The border agency is created by statute and its internal geography is created by the same statute. 6 U.S.C. § 211(a) provides that "There is established in the Department an agency to be known as U.S. Customs and Border Protection". Section 211(e)(1) then provides that "There is established in U.S. Customs and Border Protection the U.S. Border Patrol" — so the Border Patrol is not a separate force but an office inside the agency, headed by a Chief who reports to the Commissioner.

The line that matters most is drawn inside that one agency. The Border Patrol’s statutory responsibility is interdicting people and goods crossing "at a place other than a designated port of entry" (§ 211(e)(3)(A)). The ports of entry themselves are worked by the agency’s other operational offices, and Air and Marine Operations — also established inside CBP, by § 211(f) — has primary responsibility in the air and maritime environment. One agency therefore covers the ports, the ground between them, and the air and sea approaches.

The immigration function, by contrast, is divided — and the statute says so itself rather than leaving it to an organisation chart. Section 211(c)(8) directs CBP to "in coordination with U.S. Immigration and Customs Enforcement and United States Citizenship and Immigration Services, enforce and administer all immigration laws", and gives CBP the inspection and admission of people entering or departing, and the interdiction and short-term detention of people unlawfully entering or recently entered. Three named agencies, one function, and a statutory instruction that they coordinate.

What distinguishes the second agency from the first is where it works rather than what it enforces. ICE’s own account is that it "was created in 2003 through a merger of the investigative and interior enforcement elements of the former U.S. Customs Service and the Immigration and Naturalization Service", and it names Homeland Security Investigations, Enforcement and Removal Operations and the Office of the Principal Legal Advisor among its directorates. The word doing the work is interior: CBP and ICE both enforce customs and immigration law, and the border is the division between them.

Analysis

Two agencies whose legal names are not the names they use

The Code establishes ICE in a sentence that does not call it ICE. Section 252 is headed "U.S. Immigration and Customs Enforcement", and every provision after the first uses that name — but § 252(a)(1) itself reads: "There shall be in the Department of Homeland Security a bureau to be known as the Bureau of Border Security." The same is true next door: § 271(a)(1) establishes "a bureau to be known as the Bureau of Citizenship and Immigration Services", and refers throughout to "the Bureau of Border Security". Both names come from the 2002 Act that created them; neither agency uses its codified name. Section 211, amended later, does use the operating name. This is worth stating plainly because a reader searching the Code for the agency they have heard of will not find the sentence that creates it.

At sea the arrangement changes shape entirely. The Coast Guard is required by 14 U.S.C. § 102(1) to "enforce or assist in the enforcement of all applicable Federal laws on, under, and over the high seas and waters subject to the jurisdiction of the United States" — a duty defined by PLACE rather than by subject matter, which is the opposite of how the three Homeland Security agencies are defined. Section 522(a) gives it the power to make inquiries, examinations, inspections, searches, seizures and arrests in those waters.

One dimension present in many systems is absent here. The United States is in no customs union, no common travel area and no shared external-border regime of the kind that would make its border partly somebody else’s to administer. Its bilateral arrangements with Canada and Mexico were not researched and nothing on this page rests on them.

AnalysisThe contrast with the one other system described here is sharp in both directions. Canada puts customs, immigration examination and food-safety inspection into a single agency at the ports of entry, and the federal police between them — so the ports/between-ports line is a line between two organisations. The United States draws that same line inside one agency, and instead divides the immigration function across three. Neither country has a single body that both guards the border and decides who may stay. Australia is a third arrangement again: one force holding customs, migration and maritime powers together, inside the department rather than beside it.

Uncertainty

What we could not establish

The Coast Guard is described from its own title of the United States Code, not from its own pages. uscg.mil answered an automated request with HTTP 403 and no bot protection was bypassed, so what the service says about itself is not used anywhere here. Its organisation, and its relationship to the Navy beyond the cross-reference in § 102(7), are not established.
How the Coast Guard’s maritime role and Air and Marine Operations’ maritime role fit together was not established. Both are stated here from their own statutes; nothing read says which acts where, and nothing on this page should be taken to.
Nothing here describes enforcement practice, detention, removal, or the exercise of any power against a person. That is deliberate and permanent for this platform, not a gap awaiting research.
The internal structure of CBP beyond the offices the statute establishes was not researched, and the Office of Field Operations — which works the ports of entry — is named on the agency’s pages rather than in § 211, so it is not described here.
Whether the reporting line in § 252 is the current one was not established. The section is read for what it enacts.
Staffing figures appear on both agencies’ own pages and are not published here. A workforce number is a claim about the present that decays without notice, and neither page carries a dated series behind it.
State and local involvement in immigration enforcement was not researched, and nothing here describes it. In a system where most policing is state and local, that is a substantial absence rather than a minor one.

Sources

6 U.S.C. § 211 — Establishment of U.S. Customs and Border Protection; Commissioner, Deputy Commissioner, and operational offices
U.S. Government Publishing Office (govinfo.gov) — United States Code, 2024 Edition · Legislation · link verified 2026-09-18
SCOPE: what CBP is, what it is required to do, and which offices are established inside it — and nothing about the other agencies except where this section names them. The official codified text, read directly from the Government Publishing Office. Supports § 211(a), that "There is established in the Department an agency to be known as U.S. Customs and Border Protection". Supports § 211(e)(1), that "There is established in U.S. Customs and Border Protection the U.S. Border Patrol", and § 211(e)(3)(A), giving the Border Patrol primary responsibility for interdiction "at a place other than a designated port of entry". Supports § 211(f), that Air and Marine Operations is established in CBP with primary responsibility in the air and maritime environment. THE STRUCTURAL FINDING IS § 211(c)(8): CBP is to "in coordination with U.S. Immigration and Customs Enforcement and United States Citizenship and Immigration Services, enforce and administer all immigration laws" — the three-way division of the immigration function is stated by the statute itself rather than inferred from an organisation chart. Establishes nothing about how any power is exercised, nothing about detention, and nothing about the Coast Guard.
6 U.S.C. § 252 — U.S. Immigration and Customs Enforcement
U.S. Government Publishing Office (govinfo.gov) — United States Code, 2024 Edition · Legislation · link verified 2026-09-18
SCOPE: what the Code says ICE is. The official codified text, read directly. Supports the section heading "U.S. Immigration and Customs Enforcement" and, at § 252(a)(1), that "There shall be in the Department of Homeland Security a bureau to be known as the Bureau of Border Security". THE NAMES DIVERGE INSIDE THE SECTION, and that is the finding: the heading and every later provision say U.S. Immigration and Customs Enforcement, while the sentence that establishes the body says Bureau of Border Security. Supports that the head of ICE reports to the Under Secretary for Border and Transportation Security. This record does NOT establish whether that reporting line is the current one — the section states a chain of command as enacted, and whether it still runs that way was not researched. Establishes nothing about the directorates, which this section does not mention.
6 U.S.C. § 271 — Establishment of Bureau of Citizenship and Immigration Services
U.S. Government Publishing Office (govinfo.gov) — United States Code, 2024 Edition · Legislation · link verified 2026-09-18
SCOPE: what the Code says the immigration-benefits agency is. The official codified text, read directly. Supports § 271(a)(1), that "There shall be in the Department a bureau to be known as the Bureau of Citizenship and Immigration Services", and § 271(a)(2)(A), that its Director "shall report directly to the Deputy Secretary". Supports that this section refers to the enforcement agency as "the Bureau of Border Security" throughout, including in the provision setting the Director’s pay. Confirms from the other side the naming divergence recorded on us-usc-6-252: the two bodies created by the 2002 Act are codified under names neither of them uses, while § 211 — amended later — uses the operating name. Establishes nothing about which benefits are granted or on what terms.
14 U.S.C. § 102 — Primary duties of the Coast Guard
U.S. Government Publishing Office (govinfo.gov) — United States Code, 2024 Edition · Legislation · link verified 2026-09-18
SCOPE: what the Coast Guard is required to do, from its own title of the Code. Read directly, because uscg.mil answers an automated request with HTTP 403 and no bot protection was bypassed. Supports § 102(1), that the Coast Guard shall "enforce or assist in the enforcement of all applicable Federal laws on, under, and over the high seas and waters subject to the jurisdiction of the United States", and § 102(2), maritime air surveillance or interdiction to enforce or assist in enforcing the laws of the United States. THE PHRASE THAT MATTERS IS "ALL APPLICABLE FEDERAL LAWS": the duty is not defined by subject matter but by place, which is the opposite of how the three Homeland Security agencies are defined. Establishes nothing about how the Coast Guard is organised, nothing about its relationship to the Navy beyond the cross-reference in § 102(7), and nothing about any operation.
14 U.S.C. § 522 — Law enforcement
U.S. Government Publishing Office (govinfo.gov) — United States Code, 2024 Edition · Legislation · link verified 2026-09-18
SCOPE: the Coast Guard’s law-enforcement authority and the capacity in which it exercises it. The official codified text, read directly. Supports § 522(a), that the Coast Guard "may make inquiries, examinations, inspections, searches, seizures, and arrests upon the high seas and waters over which the United States has jurisdiction, for the prevention, detection, and suppression of violations of laws of the United States". THE INSTITUTIONAL FINDING IS § 522(b)(1): officers enforcing a law of the United States under this section "shall be deemed to be acting as agents of the particular executive department or independent establishment charged with the administration of the particular law". That is what resolves the maritime dimension for this platform without describing any operation — at sea the Coast Guard enforces whoever’s law it is, as that department’s agent, rather than holding a border mandate of its own. Establishes nothing about immigration procedure, nothing about interdiction practice, and nothing about what happens to a person after an arrest.
About CBP — U.S. Customs and Border Protection
U.S. Customs and Border Protection · Institutional (self-description) · link verified 2026-09-17
SCOPE: U.S. Customs and Border Protection only. The agency's own about page, read directly. Supports the official name, CBP's placement within the Department of Homeland Security, and its own description of preventing terrorists and their weapons from entering the United States while facilitating lawful trade and travel. The page carries a workforce figure, which is NOT published — a staffing number is a claim about the present that decays without notice. Establishes nothing about any other DHS component.
Who We Are — U.S. Immigration and Customs Enforcement
U.S. Immigration and Customs Enforcement · Institutional (self-description) · link verified 2026-09-18
SCOPE: the agency’s own account of what it is and where it came from. Read directly. Supports that "ICE was created in 2003 through a merger of the investigative and interior enforcement elements of the former U.S. Customs Service and the Immigration and Naturalization Service", and that the agency names Homeland Security Investigations, Enforcement and Removal Operations and the Office of the Principal Legal Advisor among its directorates. THE WORD THAT MATTERS IS "INTERIOR": the agency’s own account of its origin places it away from the border, which is what distinguishes it from CBP and is stated in neither section of the Code. The page carries a headcount and an office count; NEITHER IS USED, for the same reason the CBP page’s workforce figure is not. Establishes nothing about enforcement practice, detention or removal procedure, and this platform does not describe them.