Continental United States

Continental United States
Usa_edcp_location_map.svg: Uwe Dedering derivative work:  –droll [chat] · CC BY-SA 3.0 · source
Name	Continental United States
Capital	Washington, D.C.
Largest city	New York City
Area km2	8093314
Population	331 million (approx.)
Population year	2020

Continental United States is the region of the United States lying on the mainland of the North American continent and contiguous among the forty-eight adjoining states. It excludes Alaska and Hawaii while including the federal district of Washington, D.C. and the states that share land borders with Canada and Mexico. The term is commonly used in legal, logistical, and colloquial contexts to distinguish the contiguous landmass from noncontiguous jurisdictions such as Alaska and Hawaii.

Definition and Terminology

The phrase traces usage alongside terms like Contiguous United States, Lower 48, and the CONUS abbreviation in United States Armed Forces logistics and federal statutes. Legal instruments contrast it with Non-contiguous United States classifications appearing in federal procurement, tax law, and emergency declarations administered by agencies including the Federal Emergency Management Agency and the United States Department of Defense. Cartographers and publishers sometimes prefer continental, while media outlets and transportation firms often use contiguous or lower 48 to indicate mainland routing between hubs such as Los Angeles, Chicago, Miami, Seattle, and Boston.

Geography and Boundaries

The continental area spans from the Atlantic shores of Maine and Florida to the Pacific coasts of California and Washington, bordered to the north by Canada—including provinces like Ontario and Quebec—and to the south by Mexico—including states such as Baja California and Chihuahua across the Rio Grande. Major physiographic regions include the Appalachian Mountains, the Great Plains, the Mississippi River drainage basin, the Rocky Mountains, the Great Basin, and the Sierra Nevada. Significant coastal features include the Gulf of Mexico, Chesapeake Bay, and the Puget Sound, while inland landmarks encompass Great Salt Lake, Lake Michigan, and the Missouri River. Climate zones range from the humid subtropical of New Orleans and Houston to the arid deserts near Phoenix and Las Vegas, and the continental climates of Denver and Minneapolis.

History and Settlement

Pre-contact indigenous nations such as the Iroquois Confederacy, the Cherokee Nation, the Lakota, the Navajo Nation, and the Pueblo peoples inhabited the continental landmass for millennia. European colonization involved powers including Spain, France, England, and Russia and events such as the Spanish colonization of the Americas, the French and Indian War, and the American Revolutionary War reshaped control. The Louisiana Purchase, the Mexican–American War, and the Adams–Onís Treaty altered territorial boundaries and led to incorporation of regions like the Territory of Louisiana, California Republic, and Texas Annexation into the national union. Westward expansion was driven by routes including the Oregon Trail and legislation such as the Homestead Act, while conflicts like the American Civil War and policies like Indian Removal Act had profound demographic and political effects.

Demographics and Economy

Population centers include metropolitan areas such as New York City metropolitan area, Los Angeles County, Chicago metropolitan area, Dallas–Fort Worth metroplex, and Philadelphia. Ethnic and cultural diversity reflects migration from regions including Ireland, Germany, Italy, Mexico, China, and the Philippines, and internal movements like the Great Migration of African Americans reshaped urban demographics in cities such as Detroit and Atlanta. Economic activity spans finance in Wall Street and Silicon Valley, manufacturing in Pittsburgh and Detroit, energy production in Houston and Bakken Formation, and agriculture across Iowa, Kansas, and California Central Valley. Trade corridors link ports such as Port of Los Angeles, Port of New York and New Jersey, and Port of Savannah with inland distribution networks centered on hubs like Chicago and Memphis.

Government and Political Status

Politically, the continental states participate in federal institutions based in Washington, D.C. including representation in the United States Congress via the Senate and the House of Representatives. Constitutional amendments ratified through processes involving state legislatures, such as the 19th Amendment and the 26th Amendment, apply across the continental states. Federal statutes enforced by agencies like the Internal Revenue Service, the United States Postal Service, and the National Park Service operate throughout, while federal judicial circuits including the Ninth Circuit Court of Appeals and the Fifth Circuit Court of Appeals adjudicate matters arising in continental jurisdictions. Interstate compacts and regional organizations—such as the Port Authority of New York and New Jersey and the Metropolitan Transportation Authority—coordinate cross-border administration among states like New York and New Jersey.

Transportation and Infrastructure

A dense network of interstate highways—starting with the Interstate Highway System routes like Interstate 95, Interstate 80, and Interstate 10—connects major cities such as Boston, San Francisco, Houston, and Phoenix. Rail corridors operated by Amtrak and freight carriers including Union Pacific Railroad and BNSF Railway traverse the continental interior, while airports such as Hartsfield–Jackson Atlanta International Airport, Los Angeles International Airport, and Chicago O'Hare International Airport serve global air traffic. Inland waterways using the Mississippi River and canal systems support barge transport between ports such as New Orleans and St. Louis. Energy and telecommunications infrastructure link regional grids like the Eastern Interconnection and Western Interconnection and fiber backbones running through hubs like Ashburn, Virginia.

Category:Regions of the United States