This treaty was made between the US and Spain.
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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.
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''.
The Us acquired Florida from Spain.