The United States acquire the Louisiana Purchase by buying it from France, option C is correct.
The Louisiana Purchase means the acquiring of the territorial dominion of Louisiana by the US from Napoleonic France in 1803. In return to the 15 millions dollar, the US purchased a total of 828,000 sq. mi.
The Sphere of French Republic had commanded the Louisiana territory from 1699 until it was granted to Spain in 1762.
Therefore, option C is correct.
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