Answer:
The Spanish borderland became subject of argument in the late seventeenth century when Rene Robert Cavelier, sieur de La Salle, sailed down the Mississippi claiming Louisiana for the French in 1682. The Spanish sent colonist into Texas to counter the French, and established a permanent frontier outpost at Los Adaes on the Louisiana border in 1716 and within decades' British settlers in the Carolina posed a threat to Spanish Florida. The eighteenth century marked by a series of wars between the French, British, Spanish and their Indian allies to control what would later become the southeastern United States. In 1763 these rivalries took a new turn when France yielded its North American possessions following the Seven Years' War. When war is yet to come to an end, France ceded western Louisiana to Spain as compensation for its help in the war. England confirmed Spain's title to western Louisiana in return of Florida during the Treaty of Paris in 1763. In 1800, Spain ceded Louisiana back to France and the Mississippi became the new border between English and Spanish North America. When thirteen colonies revolted in 1776, the Spanish provided financial and military assistant, driving the British from the Mississippi and gulf region. As a reward, the United States returned Florida to Spain during the Treaty of Paris in 1783.
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