According to our Big Budget Events slideshow, how much did the Louisiana Purchase cost in today's dollars?

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Question: According to our Big Budget Events slideshow, how much did the Louisiana Purchase cost in today's dollars?

Answer: $217 billion

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Louisiana Purchase

Original Cost: $15 million
Inflation Adjusted Cost: $217 billion

The Louisiana Purchase was the United States' acquisition of 829,000 square miles of land from the French for the Louisiana Territory. The land covered territory from the Mississippi River that reached out as far north and west as Montana and Wyoming and south into parts of Texas.