Borders of the United States

The United States shares international land borders with two nations:

The Canada–United States border to the north of the Contiguous United States and to the east of Alaska
The Mexico–United States border to the south.
The Russia–United States maritime boundary was defined by a disputed agreement covering the Bering Sea, Bering Strait, and Arctic Ocean. The International Date Line essentially acts as the de facto border between the two nations; the USA ratified the USSR–USA Maritime Boundary Agreement, but the USSR failed to ratify it before dissolving, and it was subsequently never ratified by Russia. During the winter, travel between Russia's uninhabited Big Diomede Island and Alaska's Little Diomede Island with a population of 110[1] is theoretically possible, although not legal, on some occasions when ice flowing through the Bering Strait clogs between the two islands.[2] West of Puerto Rico, the Mona Passage serves as maritime boundary with the Dominican Republic, and the US shares a border with the United Kingdom east of the US Virgin Islands.

The Third Border Initiative is an area of foreign policy concerning the Caribbean Sea border between the United States and the Caribbean region.

Insular areas in the Pacific, and the U.S. Virgin Islands are in a separate customs territory from the 50 States, the District of Columbia, and Puerto Rico (see Foreign trade of the United States).

In the continental United States, the country shares maritime borders with Cuba and the Bahamas, while sharing maritime borders with the United Kingdom in the Virgin Islands, the Dominican Republic in Puerto Rico, and Samoa in American Samoa.

Border disputes

The US also has disputed land borders with seven nations:

Canada
- Machias Seal Island and North Rock (New Brunswick and Maine) - Occupied by Canada and patrolled by the Canadian Coast Guard, claimed by the US.
Cuba
- Guantanamo Bay Naval Base - Since the Cuban Revolution of 1959, the Cuban communist government has consistently protested against the U.S. presence on Cuban soil and called it "illegal" under international law. The US acquired the bay from the Spanish-American War as a lease from Cuba.
Haiti
- Navassa Island - The US claimed the Navassa island via the Guano Islands Act of 1856. Haiti claimed sovereignty over the island in 1801, but was occupied by the US through gunboat diplomacy.
Colombia, Jamaica, Nicaragua
- Bajo Nuevo Bank - Administered by Colombia, claimed by the US as an unorganized, unincorporated territory.[3]
Colombia, Honduras, Jamaica
- Serranilla Bank - Administered by Colombia, claimed by the US as an unorganized, unincorporated territory.

Additionally, the US has maritime border disputes with Canada:

Strait of Juan de Fuca
Beaufort Sea - Yukon–Alaska dispute
Dixon Entrance - Dispute stems from the ambiguity of the Hay–Herbert Treaty in 1903 between the United States and the United Kingdom signed to settle the Alaska boundary dispute, an agreement opposed by Canadian leaders.

Agencies

U.S. Customs and Border Protection is responsible for policing the borders and inspecting people and goods being imported.

The United States Coast Guard actively patrols the nation's extensive maritime borders.

The United States Armed Forces and state and local police may also become involved in border enforcement in certain circumstances.

Total list

Country or territory	No. of land border neighbors[4]	No. of maritime boundary neighbors[4]	Total no. of unique neighbors[4]	Neighboring countries and territories (Territories without full sovereignty[5] in italics) (L) = share only land borders (M) = share only maritime boundaries(D) = share disputed boundaries blank = share land borders and maritime boundaries
United States[6]	2	5	5	Bahamas (M) Canada Cuba (M) Mexico Russia (M)
United States (including insular areas) includes: → American Samoa → Baker Island → Guam → Howland Island → Jarvis Island → Johnston Atoll → Kingman Reef → Midway Atoll → Navassa Island (disputed with Haiti) → Northern Mariana Islands → Palmyra Atoll → Puerto Rico → United States Virgin Islands → Wake Island	2	16 (19)	16 (19)	Bahamas (M) Canada Cuba (M) Dominican Republic (M) Haiti (M/D) Jamaica (M/D) Japan (M) Kiribati (M) Marshall Islands (M) Mexico Federated States of Micronesia (M) Netherlands (M) Russia (M) Samoa (M) Tonga (M) Venezuela (M) Anguilla (United Kingdom) (M) British Virgin Islands (United Kingdom) (M) Cook Islands (New Zealand) (M) Niue (New Zealand) (M) Tokelau (New Zealand) (M)
United States (including insular areas and disputed territories) includes the aforementioned areas and: →Bajo Nuevo Bank (disputed with Colombia, Jamaica, & Nicaragua) →Guántanamo Bay (disputed with Cuba) →Machias Seal Island and North Rock (disputed with Canada) → Navassa Island (disputed with Haiti) →Serranilla Bank (disputed with Colombia, Honduras, & Jamaica)	3	21 (24)	21 (24)	Bahamas (M) Canada Colombia (M) Cuba Dominican Republic (M) Haiti (M) Honduras (M) Jamaica (M) Japan (M) Kiribati (M) Marshall Islands (M) Mexico Federated States of Micronesia (M) Netherlands (M) Nicaragua (M) Russia (M) Samoa (M) Tonga (M) Venezuela (M) Anguilla (United Kingdom) (M) British Virgin Islands (United Kingdom) (M) Cook Islands (New Zealand) (M) Niue (New Zealand) (M) Tokelau (New Zealand) (M)

References

Local Economic Development Plan for Diomede 2012-2017, citing 2010 U.S. census (and this was a decline since the 2000 census
http://www.amusingplanet.com/2014/02/diomede-islands-two-islands-split-by-us.html
"Bajo Nueva Bank – De Facto". defactoborders.org. Retrieved 2020-10-06.
A number in parentheses indicates the number of unique sovereign states that the country or territory shares as neighbors.
The concept of state sovereignty is somewhat imprecise and there are disagreements about whether certain territories are sovereign. There are currently 195 states that are generally regarded as "fully" sovereign: this includes the 193 member states of the United Nations plus the observer states of Vatican City and the State of Palestine. Some of these states have under their jurisdiction territories, dependencies, or collectivities that are clearly non-sovereign geographical areas. These territories are generally regarded as being subsumed within the overarching sovereignty of the governing state. For example, the United Kingdom holds sovereignty over the territory of Gibraltar, even though Gibraltar is not considered to be part of the United Kingdom. There are a few territories in the world that are neither clearly sovereign nor clearly subsumed under another state's sovereignty. Often, these territories have declared themselves to be sovereign, but they are either not widely recognized as such or lack some of the necessary conditions for sovereign statehood. In these cases, explanatory footnotes indicate how the territory is treated for the purposes of this list.
Excluding U.S. insular areas.

External links

Border Security at CBP
Secure and Manage Borders at DHS
Border Security at the WhiteHouse.gov
The Constitution in the 100-Mile Border Zone at ACLU

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[Local_Economic_Development_Plan-1] Local Economic Development Plan for Diomede 2012-2017, citing 2010 U.S. census (and this was a decline since the 2000 census

[amusingplanet-2] ttp://www.amusingplanet.com/2014/02/diomede-islands-two-islands-split-by-us.html

[Bajo_Nueva_Bank-3] "Bajo Nueva Bank – De Facto". defactoborders.org. Retrieved 2020-10-06.

[unique-4] A number in parentheses indicates the number of unique sovereign states that the country or territory shares as neighbors.

[sovereign-5] The concept of state sovereignty is somewhat imprecise and there are disagreements about whether certain territories are sovereign. There are currently 195 states that are generally regarded as "fully" sovereign: this includes the 193 member states of the United Nations plus the observer states of Vatican City and the State of Palestine. Some of these states have under their jurisdiction territories, dependencies, or collectivities that are clearly non-sovereign geographical areas. These territories are generally regarded as being subsumed within the overarching sovereignty of the governing state. For example, the United Kingdom holds sovereignty over the territory of Gibraltar, even though Gibraltar is not considered to be part of the United Kingdom. There are a few territories in the world that are neither clearly sovereign nor clearly subsumed under another state's sovereignty. Often, these territories have declared themselves to be sovereign, but they are either not widely recognized as such or lack some of the necessary conditions for sovereign statehood. In these cases, explanatory footnotes indicate how the territory is treated for the purposes of this list.

[insular_areas-6] Excluding U.S. insular areas.

Borders of North America
Sovereign states	Antigua and Barbuda Bahamas Barbados Belize Canada Costa Rica Cuba Dominica Dominican Republic El Salvador Grenada Guatemala Haiti Honduras Jamaica Mexico Nicaragua Panama Saint Kitts and Nevis Saint Lucia Saint Vincent and the Grenadines Trinidad and Tobago United States
Dependencies and other territories	Anguilla Aruba Bermuda Bonaire British Virgin Islands Cayman Islands Curaçao Greenland Guadeloupe Martinique Montserrat Puerto Rico Saint Barthélemy Saint Martin Saint Pierre and Miquelon Saba Sint Eustatius Sint Maarten Turks and Caicos Islands United States Virgin Islands