October 20 in American History

October 20, 1803 — the Senate ratifies the Louisiana Purchase

The Senate approved Jefferson's purchase of the Louisiana Territory from France, doubling the size of the United States overnight for about $15 million. Jefferson worried the Constitution didn't clearly authorize it — and did the deal anyway. The single largest land expansion in American history.

Common Questions

What happened on October 20 in American history?

In 1803: the Senate ratifies the Louisiana Purchase. The Senate approved Jefferson's purchase of the Louisiana Territory from France, doubling the size of the United States overnight for about $15 million.

Why is October 20 significant?

The Senate approved Jefferson's purchase of the Louisiana Territory from France, doubling the size of the United States overnight for about $15 million. Jefferson worried the Constitution didn't clearly authorize it — and did the deal anyway. The single largest land expansion in American history.

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