The French wanted to control Louisiana. The Mississippi River that open ports in Louisiana is a very important trade route.
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Louisiana
What about them? They bought the Louisiana Territory from the French.
The Louisiana Territory was purchases from Napoleon Bonaparte of France.
Because Napoleon needed money to continue the war in Europe, the Louisiana Purchase was sold to the US for $15 million.
France was cash strapped and needed funds to continue their war in Europe. Napoleon saw that the defense of the French property in the New World would be a long term drain on finances of the Empire. The slave revolt in Haiti was costing already much more then the return on sugar sales. It was obvious that the United States needed guaranteed access to the Gulf of Mexico and could probably take Louisiana by force if it could not get it peaceably.