United States territorial acquisitions
West Florida was declared to be a U.S. possession in 1810 by President James Madison after the territory had declared its independence from Spain. Madison ordered the U.S. Army to take control. Six weeks later, the army entered and occupied the capital, St. Francisville, putting an end to the republic after 74 days of independence. Spain did not relinquish its claim to sovereignty (see West Florida Controversy) until ratification of the Adams–Onís Treaty. General Andrew Jackson personally accepted the delivery of West Florida from its Spanish governor on July 17, 1821.
British America
British America gained large amounts of new territory following the Treaty of Paris (1763) which ended the French and Indian War in America, and ended British involvement in the Seven Years' War in Europe. At the start of the Revolutionary War in 1775, the British Empire included 20 colonies north and east of New Spain, including areas of Mexico and the Western United States. East and West Florida were ceded to the Kingdom of Spain in the Treaty of Paris (1783) which ended the American Revolution, and then ceded by Spain to the United States in 1819 after treaty negotiations to settle the old southwest border with Spanish Florida (eastern Louisiana, southern Alabama, Mississippi, and western Georgia). The remaining continental colonies of British North America to the northeast formed the Dominion of Canada by uniting provinces between 1867 and 1873. The Dominion of Newfoundland to the east joined Canada in 1949.