4 jul 1803 ano - Louisiana Purchase
Descrição:
The Louisiana Purchase was the acquisition of the Louisiana territory (828,000 square miles or 2.14 million km²) by the United States from France in 1803.
The U.S. paid fifty million francs ($11,250,000) and a cancellation of debts worth eighteen million francs ($3,750,000) for a total of sixty-eight million francs ($15 million, equivalent to $300 million in 2016).
The Louisiana territory included land from fifteen present U.S. states and two Canadian provinces.
https://en.wikipedia.org/wiki/Louisiana_Purchase
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