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Original territory of the Thirteen States (western lands, roughly between the Mississippi River and Appalachian Mountains, were claimed but not administered by the states and were all ceded to the federal government or new states by 1802) 1783: 892,135: 2,310,619----- Annexation of the Vermont Republic: 1791: 9,616: 24,905----- Louisiana ...
1815 – With the end of the War of 1812, the borders between British North America and the United States of America return to their pre-war borders. 1818 – The borders between British North America and the United States during the Treaty of 1818 are established at the 49th parallel north, west of the Lake of the Woods.
Since the 19th century, the United States government has participated and interfered, both overtly and covertly, in the replacement of many foreign governments. In the latter half of the 19th century, the U.S. government initiated actions for regime change mainly in Latin America and the southwest Pacific, including the Spanish–American and Philippine–American wars.
1846–1848: During the Mexican–American War, Mexico and the United States warred over Texas, California, and what today is the American Southwest but was then part of Mexico. During this war, U.S. Armed Forces troops invaded and occupied parts of Mexico, including Veracruz and Mexico City.
The United States has been involved in 118 military conflicts. These include major conflicts like the American Revolutionary War, the War of 1812, the Mexican–American War, the American Civil War, the Spanish-American War, World War I, World War II and the Gulf War.
1846–1848: Mexican–American War: On May 13, 1846, the United States recognized the existence of a state of war with Mexico. After the annexation of Texas in 1845, the United States and Mexico failed to resolve a boundary dispute and President Polk said that it was necessary to deploy forces in Mexico to meet a threatened invasion.
The United States in the Supreme War Council: American War Aims and Inter-Allied Strategy, 1917–1918 (1961) Trask, David F. The AEF and Coalition Warmaking, 1917–1918 (1993)online free; Trask, David F ed. World War I at home; readings on American life, 1914-1920 (1969) primary sources online; Tucker, Spencer C., and Priscilla Mary Roberts, eds.
Battles generally refer to short periods of intense combat localized to a specific area and over a specific period of time. However, use of the terms in naming such events is not consistent. For example, the First Battle of the Atlantic was more or less an entire theatre of war, and the so-called battle lasted for the duration of the entire war ...