On this day in 1803, the United States purchased the Louisiana Territory from France. The territory had been controlled by the French through most of the 18th century and they had established the port of New Orleans and a few trading posts up the Mississippi. It became a pawn on the chessboard of European politics in 1762 when France ceded it to Spain in the secret Treaty of Fontainbleu as part of France's maneuvering during the Seven Years War. That was effectively a world war between Britain and its allies vs. France and its allies and spanning five continents. This war in turn exploded out of a colonial war waged between Britain and France for colonial expansion in the late 1750's. The French and Indian War in the Americas was part of that conflict and gave a young George Washington some military experience. The Seven Years War was touched off when Prussia, believing that war in Europe between Britain and France was inevitable, preemptively invaded Saxony and recapture...