Spanish Florida () was the first major European land claim and attempted settlement area in northern America during the European Age of Discovery. La Florida formed part of the Captaincy General of Cuba in the Viceroyalty of New Spain, and the Spanish Empire during Spanish colonization of the Americas.

While its boundaries were never clearly or formally defined, the territory was initially much larger than the present-day state of Florida, extending over much of what is now the southeastern United States, including all of present-day Florida plus portions of Georgia, South Carolina, North Carolina, Alabama, Mississippi, and the Florida Parishes of Louisiana. Spain based its claim to this vast area on several wide-ranging expeditions mounted during the 16th century. A number of missions, settlements, and small forts existed in the 16th and to a lesser extent in the 17th century; they were eventually abandoned due to pressure from the expanding English and French colonial settlements, the collapse of the native populations, and the general difficulty in becoming agriculturally or economically self-sufficient. By the 18th century, Spain's control over La Florida did not extend much beyond a handful of forts near St. Augustine, St. Marks, and Pensacola, all within the boundaries of present-day Florida.

The Spanish Empire regarded Florida as a backwater, which served primarily as a strategic buffer between the rest of New Spain and the expanding English colonies to the north. In contrast with the conquistadors of Mexico or of Peru, the Spaniards in found no gold or silver. Due to disease and, later, raids by colonists of the Province of Carolina (chartered in 1663) and their Native American allies, the native population was not large enough for an encomienda system of forced agricultural labor, so Spain did not establish large plantations in Florida. Large free-range cattle ranches in north-central Florida were the most successful agricultural enterprise and were able to supply both local and Cuban markets. The coastal towns of Pensacola and St. Augustine also provided ports where Spanish ships needing water or supplies could stop and resupply.

Beginning in the 1630s, a series of missions stretching from St. Augustine to the Florida panhandle supplied St. Augustine with maize and other food crops, and the Spaniards required Apalachees who lived at the missions to send workers to St. AugustineCompare: every year to perform labor in the town. The missions were destroyed by Carolina and Creek raiders in a series of raids from 1702 to 1704, further reducing and dispersing the native population of Florida and reducing Spanish control over the area.

Great Britain took possession of Florida as part of the agreements ending the Seven Years' War in 1763, and the Spanish population largely emigrated to Cuba. The new colonial ruler divided the territory into East and West Florida.

First Spanish period Establishment of Spanish Florida

Spanish Florida was established in 1513, when Juan Ponce de León claimed peninsular Florida for Spain during the first European expedition to the region. This claim was enlarged as several explorers (most notably Pánfilo Narváez and Hernando de Soto) landed near Tampa Bay in the mid-1500s and wandered as far north as the Appalachian Mountains and as far west as Texas in largely unsuccessful searches for gold.

The Spanish relied on alliances with indigenous leaders (caciques) to ensure colonial control over the people and territories of Florida during the late 16th century. Within the existing native political systems, caciques regularly allied with the Spanish to enhance their power, seek protection against rivals, and acquire exotic goods. These alliances were frequently unstable because of disease, violence and shifting colonial priorities.

On September 8, 1565, Admiral Pedro Menéndez de Avilés landed with a band of settlers to found St. Augustine. Father Francisco López de Mendoza Grajales, the chaplain of the expedition, celebrated the first Thanksgiving Mass on the grounds. The formal Franciscan outpost, Mission Nombre de Dios, was founded at the landing point, perhaps the first mission in what would become the continental United States.Herreros, Mauricio Spiritual Florida: A Guide to Retreat Centers and Religious Sites in Florida, p. 25 The mission served nearby villages of the Mocama, a Timucua group, and was at the center of an important chiefdom in the late 16th and 17th century. A series of missions were then established across the Florida panhandle, Georgia, and South Carolina during the 1600s; and Pensacola was founded on the western Florida panhandle in 1698, strengthening Spanish claims to that section of the territory.

Spanish control of the Florida peninsula was much facilitated by the collapse of native cultures during the 17th century. Several Native American groups (including the Timucua, Calusa, Tequesta, Apalachee, Tocobaga, and the Ais people) had been long-established residents of Florida, and most resisted Spanish incursions onto their land. However, conflict with Spanish expeditions, raids by the Carolina colonists and their native allies, and (especially) diseases brought from Europe resulted in a drastic decline in the population of all the indigenous peoples of Florida, and large swaths of the peninsula were mostly uninhabited by the early 1700s. During the mid-1700s, small bands of Creek and other Native American refugees began moving south into Spanish Florida after having been forced off their lands by South Carolinan settlements and raids. They were later joined by African-Americans fleeing slavery in nearby colonies. These newcomers – plus perhaps a few surviving descendants of indigenous Florida peoples – eventually coalesced into a new Seminole culture.

Contraction of Spanish Florida The extent of Spanish Florida began to shrink in the 1600s, and the mission system was gradually abandoned due to native depopulation. Between disease, poor management, and ill-timed hurricanes, several Spanish attempts to establish new settlements in La Florida ended in failure. With no gold or silver in the region, Spain regarded Florida (and particularly the heavily fortified town of St. Augustine) primarily as a buffer between its more prosperous colonies to the south and west and several newly established rival European colonies to the north. The establishment of the Province of Carolina by the English in 1639, New Orleans by the French in 1718, and of the Province of Georgia by Great Britain in 1732 limited the boundaries of Florida over Spanish objections. The War of Jenkins' Ear (1739–1748) included a British attack on St. Augustine and a Spanish invasion of Georgia, both of which were repulsed. At the conclusion of the war, the northern boundary of Spanish Florida was set near the current northern border of modern-day Florida.

Other European powers Great Britain temporarily gained control of Florida beginning in 1763 as a result of the Anglo-Spanish War when the British captured Havana, the principal port of Spain's New World colonies. Peace was signed in February, 1763, and the British left Cuba in July that year, having traded Cuba to Spain for Florida (the Spanish population of Florida likewise traded positions and emigrated to the island). But while Britain occupied Floridan territory, it did not develop it further. Sparsely populated British Florida stayed loyal to the Crown during the American Revolutionary War, and by the terms of the Treaty of Paris which ended the war, the territory was returned to Spain in 1783. After a brief diplomatic border dispute with the fledgling United States, the countries set a territorial border and allowed Americans free navigation of the Mississippi River by the terms of Pinckney's Treaty in 1795.

France sold Louisiana to the United States in 1803. The U.S. claimed that the transaction included West Florida, while Spain insisted that the area was not part of Louisiana and was still Spanish territory. In 1810, the United States intervened in a local uprising in West Florida, and by 1812, the Mobile District was absorbed into the U.S. territory of Mississippi, reducing the borders of Spanish Florida to that of modern Florida.

In the early 1800s, tensions rose along the unguarded border between Spanish Florida and the state of Georgia as settlers skirmished with Seminoles over land and American slave-hunters raided Black Seminole villages in Florida. These tensions were exacerbated when the Seminoles aided Great Britain against the United States during the War of 1812 and led to American military incursions into northern Florida beginning in late 1814 during what became known as the First Seminole War. As with earlier American incursions into Florida, Spain protested this invasion but could not defend its territory, and instead opened diplomatic negotiations seeking a peaceful transfer of land. By the terms of the Adams–Onís Treaty of 1819, Spanish Florida ceased to exist in 1821, when control of the territory was officially transferred to the United States.

Discovery and early exploration

European discovery Juan Ponce de León is generally credited as being the first European to discover Florida. However, Spanish raiders from the Caribbean may have conducted small secret raids in Florida to capture and enslave native Floridians at some time between 1500 and 1510. Furthermore, the Cantino planisphere of 1502 and several other European maps dating from the first decade of the 16th century show a landmass near Cuba that several historians have identified as Florida. This interpretation has led to the theory that anonymous Spanish, Portuguese, or other Europeans may have mapped the southeastern part of what would later become the United States before the first major colonization of Florida. This view is disputed by at least an equal number of historians.

Juan Ponce de León expedition

In 1512, Juan Ponce de León, governor of Puerto Rico, received royal permission to search for land north of Cuba. On March 3, 1513, his expedition departed from Punta Aguada, Puerto Rico, sailing north in three ships.Proclamation presented by Dennis O. Freytes, MPA, MHR, BBA, Chair/Facilitator, 500TH Florida Discovery Council Round Table, American Veteran, Community Servant, VP NAUS SE Region; Chair Hispanic Achievers Grant Council In late March, he spotted a small island (almost certainly one of the Bahamas) but did not land. On April 2, he spotted the east coast of the Florida peninsula and went ashore the next day at an exact location that has been lost to time. Assuming that he had found a large island, he claimed the land for Spain and named it La Florida, because it was the season of Pascua Florida ("Flowery Easter") and because much of the vegetation was in bloom. After briefly exploring the area around their landing site, the expedition returned to their ships and sailed south to map the coast, encountering the Gulf Stream along the way. The expedition followed Florida's coastline all the way around the Florida Keys and north to map a portion of the Southwest Florida coast before returning to Puerto Rico.

Ponce de León did not have substantial documented interactions with Native Americans during his voyage. However, the peoples he met (likely the Timucua, Tequesta, and Calusa) were mostly hostile at first contact and knew a few Castilian words, lending credence to the idea that they had already been visited by Spanish raiders.