The factor that contributed to most of the US acquisition of Florida in 1819 were territorial disputes between Mexico and the United States. This was part of the Adams-Onis Treaty to lay out the border between the United States and Spain's colony of Mexico. This helped to ease tension between the European powers (the United Kingdom was also involved in the United States) who were battling and scrambling over colonies, with the Latin American Wars of Independence equally taking place. This also happened after the tension of the American Revolutionary War.
