From which country did the United States acquire Florida by treaty in 1819?

Which state was an independent republic from 1836 to 1845 before joining the Union? Which state was an independent kingdom before becoming a U.S. territory? From which country did the United States purchase Alaska in 1867? From which country did the United States buy the Louisiana Territory in 1803? Which Secretary of State arranged the purchase of Alaska, once mocked as his "Folly"? Which four states meet at the Four Corners? Which state is the only one that borders just one other state? Which two states border the most other states, with eight each?