Florida 1513

The first European known to have explored the coasts of Florida was the Spanish explorer and governor of Puerto Rico, Juan Ponce de León, who likely ventured in 1513 as far north as the vicinity of the future St. Augustine, naming the peninsula he believed to be an island "La Florida" and claiming it for the Spanish crown. Prior to the founding of St. Augustine in 1565, several earlier attempts at European colonization in what is now Florida were made by both Spain and France, but all failed.

The history of St. Augustine, Florida, the oldest continuously occupied settlement of European origin in the United States, began in 1565 when it was founded by the Spanish admiral, Pedro Menéndez de Avilés. The Spanish Crown issued an asiento to Menéndez, signed by King Philip II on March 20, 1565, granting him various titles, including that of Adelantado of Florida, and expansive privileges to exploit the lands in the vast territory of Spanish Florida, called La Florida by the Spaniards. This contract directed Menéndez to explore the region's Atlantic coast and report on its features, with the object of finding a suitable location to establish a permanent colony from which the Spanish treasure fleet could be defended and Spain's claimed territories in North America protected against incursions by other European powers.

In 1763, the Treaty of Paris ended the Seven Years' War. Spain ceded Florida and St. Augustine to the British, in exchange for their relinquishing control of occupied Havana. With the change of government, most of the Spanish Floridians and many freedmen departed from St. Augustine for Cuba. Only a few remained to handle unsold property and settle affairs.

The Treaty of Paris in 1783 gave the American colonies north of Florida their independence, and ceded Florida to Spain in recognition of Spanish efforts on behalf of the American colonies during the war.

Florida was ceded to the United States by Spain in the 1819 Adams–Onís Treaty, ratified in 1821; Florida officially became a U.S. possession as the Florida Territory in 1822. Andrew Jackson, a future president, was appointed its military governor and then succeeded by William Pope Duval, who was appointed territorial governor in April 1822. Florida gained statehood in 1845.

https://en.wikipedia.org/wiki/History_of_St._Augustine,_Florida