What event prompted Spain to negotiate the sale of Florida to the United States?

Question

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The Seminole War prompted Spain to negotiate the sale of Florida to the United States. The war was a conflict between the Seminole Native American tribe and the U.S. government over territory in Florida. Spain, which controlled Florida at the time, was unable to quell the conflict and saw the sale of the territory as a way to avoid further conflict and maintain diplomatic relations with the United States.

What Event Prompted Spain to Negotiate the Sale of Florida