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The Adams-Onis Treaty was signed between the United States as well as Spain, in 1819.
The Adams-Onis Treaty
The Adams-Onís Treaty with Spain went into effect in 1821.
This treaty was made between the US and Spain.
The Adams Onis treaty happened because people in the US wanted to make Florida a state so Spain gave it to the US. The treaty also made the boundary that that at the time was called ''New Spain''.