Borders of the United States

Borders of the United States
Maximilian Dörrbecker (Chumwa) · CC BY-SA 2.5 · source
Name	United States borders
Caption	Major land and maritime boundaries of the United States
Land neighbors	Canada; Mexico; Russia (maritime); Cuba (maritime)
Maritime neighbors	Russia; Cuba; Bahamas; United Kingdom (via Bermuda); France (via Saint Pierre and Miquelon)

Borders of the United States

The United States shares complex land and maritime limits with neighboring polities including Canada, Mexico, and overseas partners such as Russia and the United Kingdom. These limits were shaped by treaties like the Treaty of Paris (1783), the Adams–Onís Treaty, and the Treaty of Guadalupe Hidalgo, and have been interpreted through litigation before bodies such as the International Court of Justice and institutions like the International Boundary Commission (Canada–United States). Key crossings involve nodes such as Lester B. Pearson International Airport, San Ysidro Port of Entry, and ports like Los Angeles Harbor.

Overview

The continental boundary with Canada extends from the Atlantic Ocean near Maine across the Great Lakes and the 49th parallel north to the Pacific Ocean at Washington (state), reflecting instruments including the Webster–Ashburton Treaty and the Oregon Treaty. The southern frontier with Mexico follows rivers such as the Rio Grande and stretches from El Paso, Texas to Tijuana, with crossings like Ciudad Juárez–El Paso. Overseas possessions establish maritime limits adjacent to entities such as Russia across the Bering Strait near Diomede Islands and to European overseas collectivities like Saint Pierre and Miquelon (France) near Newfoundland and Labrador. Disputes and cooperative regimes involve actors including the United States Coast Guard, the Royal Canadian Mounted Police, and agencies such as the U.S. Customs and Border Protection.

Land Borders

The northern land border with Canada is defined by features including the St. Lawrence River, the chain of Great Lakes, and the surveyed 49th parallel north; administration involves the International Boundary Commission (Canada–United States), the U.S. Geological Survey, and provincial governments like Ontario and Quebec. Boundary demarcation episodes include the Pig War on the San Juan Islands and surveys by figures such as Alexander Mackenzie and commissions formed after the War of 1812 and the Treaty of Ghent. The southern land border with Mexico traces the Rio Grande (Río Bravo del Norte) and includes administrative arrangements under the International Boundary and Water Commission; historical turning points include the Mexican–American War and the Gadsden Purchase. State and municipal crossings involve Brownsville, Texas, Laredo, Texas, Nogales, Arizona, San Diego, and Calexico, with infrastructure managed by entities like American Association of Port Authorities and binational urban regions such as the San Diego–Tijuana metropolitan area.

Maritime Boundaries

Maritime delimitation extends from baseline regimes codified by instruments inspired by concepts in the United Nations Convention on the Law of the Sea and has produced bilateral agreements with Russia in the Bering Sea, with Cuba in the Straits of Florida, and with Canada in the Atlantic Ocean and Arctic Ocean approaches. Disputed islands and features such as the Diomede Islands and areas around Saint Pierre and Miquelon have prompted arbitration involving the International Court of Justice and the International Maritime Organization. Offshore energy and resource questions have engaged corporate and regulatory actors like ExxonMobil, Chevron Corporation, Bureau of Ocean Energy Management, and national administrations including the Department of the Interior (United States). Marine conservation and enforcement involve the National Oceanic and Atmospheric Administration, the U.S. Coast Guard, and regional programs such as the Northeast Canyons and Seamounts Marine National Monument.

Border Treaties and Agreements

Foundational treaties shaping limits include the Treaty of Paris (1783), the Jay Treaty, the Webster–Ashburton Treaty (1842), the Oregon Treaty (1846), the Treaty of Guadalupe Hidalgo (1848), the Gadsden Purchase (1853), and the Adams–Onís Treaty (1819). Later instruments and commissions include the International Boundary Commission (Canada–United States), the International Boundary and Water Commission (United States and Mexico), and agreements addressing fisheries such as accords involving the North Atlantic Fisheries Organization. Boundary settlement has involved arbitration under regimes exemplified by cases like Island of Palmas Arbitration and precedents from the Permanent Court of Arbitration. Legislative and administrative frameworks impacting borders include statutes debated in the United States Congress and executive agreements negotiated by administrations such as those of Thomas Jefferson, James K. Polk, and Franklin D. Roosevelt.

Border Security and Management

Operational management is performed by agencies including U.S. Customs and Border Protection, the United States Border Patrol, the U.S. Coast Guard, and collaboration with foreign counterparts such as the Royal Canadian Mounted Police and the National Institute of Immigration and Customs Enforcement (Mexico). Security policy has been influenced by events and programs like the September 11 attacks, the Secure Fence Act of 2006, and initiatives such as the US–Mexico High Level Economic Dialogue and the Beyond the Border initiative. Cross-border law enforcement cooperation occurs through mechanisms involving the Drug Enforcement Administration, the Federal Bureau of Investigation, the Royal Canadian Mounted Police, and multilateral fora such as the Summit of the Americas. Border infrastructure projects have attracted firms like Bechtel Corporation and financing from bodies like the Inter-American Development Bank in binational contexts.

Disputed and Undefined Boundaries

Several limits have been subject to dispute or unresolved delimitation, including the maritime approaches near Saint Pierre and Miquelon, the Bering Sea continental shelf area adjacent to Russia and the Chukchi Sea, and land anomalies along the Alaskan boundary dispute and historical questions from the Pig War (1859). Arctic claims implicate states such as Canada, Russia, Norway, and institutions like the Arctic Council and the Commission on the Limits of the Continental Shelf. Resource and indigenous interests involve actors such as the Inupiaq, the Gwich'in, and agencies like the Bureau of Indian Affairs, while international adjudication options include the International Court of Justice and arbitration under the United Nations Convention on the Law of the Sea mechanisms.

Category:Borders of the United States