Florida
Florida had become a burden to Spain, which could not afford to send settlers or garrisons. Madrid therefore decided to cede the territory to the United States through the Adams–Onís Treaty, which took effect in 1821. President James Monroe was authorized on March 3, 1821 to take possession of East Florida and West Florida for the United States and provide for initial governance. Andrew Jackson, on behalf of the U.S. federal government, served as a military commissioner with the powers of governor of the newly acquired territory for a brief period. On March 30, 1822, the U.S. Congress merged East Florida and part of West Florida into the Florida Territory.
By the early 1800s, Indian removal was a significant issue throughout the southeastern U.S. and also in Florida. In 1830, the U.S. Congress passed the Indian Removal Act and as settlement increased, pressure grew on the U.S. government to remove the Indians from Florida. Seminoles offered sanctuary to blacks, and these became known as the Black Seminoles, and clashes between whites and Indians grew with the influx of new settlers. In 1832, the Treaty of Payne's Landing promised to the Seminoles lands west of the Mississippi River if they agreed to leave Florida. Many Seminole left at this time.
History of Florida
When the Colonies declared independence, many Floridians condemned it. They had been almost unaffected (because East and West Florida were backwoods areas) by the Stamp Act Crisis of 1765, which led the 13 colonies to perceive a common interest threatened by Britain. Florida declined to send delegates to the Continental Congress. The majority of Floridians were Loyalists, grateful to the Crown, that remained loyal to Britain. Many actually helped lead raids on the American South. One disastrous attempt on the part of the American Forces to invade East Florida occurred at the Battle of Thomas Creek in today's Nassau County. It was led on May 17, 1777. American Colonel John Baker surrendered to the British. Another attempt, the Battle of Alligator Bridge took place on June 30, 1778.