In conclusion, the decision to sell Florida was influenced by Spain’s diminishing ability to govern the territory, financial constraints, and a boundary dispute with the United States. The sale was facilitated by American diplomat John Quincy Adams, and Spain saw the opportunity to resolve its financial and territorial concerns.

The main reason Spain agreed to sell Florida was because Spain’s ability to govern or control the colony continued to erode, and, after repeated incursions by American forces against the Seminole people who had settled in Florida, Spain finally decided to sell the territory to the United States.

Spain decided to give up Florida to the United States because it had become a burden and they could not afford to send settlers or man garrisons to the territory. They also wanted to settle the boundary dispute along the Sabine River in Spanish Texas.