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Rene-Robert Cavelier and Sieur de La Salle claim territory by Mississippi River from Canada to Gulf of Mexico and names it Louisiana.
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Spain closes the lower Mississippi and New Orleans to foreigners.
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The French Revolution begins
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Spain cedes Louisiana to France, in exchange for a small kingdom in Italy.
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Thomas Jefferson officially announces the purchase of the Louisianan territories.
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France formally transfers the Louisiana Territories to the French.