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.
Florida State Capitol
Tallahassee was named Florida's capital in 1824, midway between the then-largest cities in the state, St. Augustine and Pensacola. The first territorial government met in a log building. A capitol building was constructed in 1826 but never completely finished. It was torn down in 1839 to make room for the erection of the present structure, which was completed in 1845, just prior to Florida's entry into the United States as the 27th state. Several additions to the historic capitol have been made throughout the years. Frank Millburn made the first expansion in 1902 by adding the classical style dome. In 1923, Henry Klutho additions included two new wings and a marble interior. Finally, large wings for the House and Senate chambers were added to the north and south ends of the building in 1936 and 1947, respectively.