Reference Entry
ADAMS–ONíS TREATY CEDES FLORIDA
On February 22nd, 1819, American and Spanish negotiators signed the Adams–Onís Treaty, transferring Spanish Florida to the United States and settling a long-troublesome frontier. For years, the border had been a patchwork where runaway enslaved people, Native communities, smugglers, and raiding parties moved in and out of reach of American authorities.
Dated Historical Context
A RECORDED MOMENT IN HISTORY
Adams–Onís Treaty cedes Florida
On February 22nd, 1819, American and Spanish negotiators signed the Adams–Onís Treaty, transferring Spanish Florida to the United States and settling a long-troublesome frontier. For years, the border had been a patchwork where runaway enslaved people, Native communities, smugglers, and raiding parties moved in and out of reach of American authorities. Army expeditions under leaders like Andrew Jackson had already pushed deep into Spanish territory, showing how unstable the situation had become. By formally acquiring Florida, the United States gained control over key ports and coastal approaches to the Gulf of Mexico, which allowed planners to think more clearly about fortifications, naval stations, and defense in depth. The treaty also clarified boundaries farther west, shaping the map on which later campaigns in Texas and the Southwest would unfold. It was a diplomatic act, but it changed the strategic geometry of the southern United States for generations.
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