John Quincy Adams signed the Florida purchase/Adams-Onís treaty in 1819, which officially ceded florida to the US and defined the boundary between the U.S. and New Spain. Spain gave Florida to the US because it had become a burden; they could not afford to send settlers or garrisons anymore.
Florida had become a burden to Spain, which could not afford to send settlers or garrisons, so the Spanish government decided to cede the territory to the United States in exchange for settling the boundary dispute along the Sabine River in Spanish Texas. I hope that this is very helpful unlike the other rude person, have a nice day
