Florida (1819) In 1819, the United States signed the Adams-Onis Treaty with Spain, making Florida a part of the United States.
Missouri (1820) Missouri was added to the United States in 1820, as part of the famous Missouri Compromise.
Texas (1821) In 1821, a man named Stephen Austin led the first American families into Texas, which at the time, was still claimed by Spanish Mexico.
Hope This Helps! Have A Nice Day!!
