April 30, 1803. United States paid $11.25 million and also agreed to take on French debt of about 3.75$ million owed to American citizens. With the purchase, the United States had more than doubled its size.
The answer is number three.
Albeit this is a basic answer, World War Two was a major catalyst to an increased focus on internationalism. In addition, financial and political interests (most notably for political interests is the Cold War) are both legitimate reasons to why the United States of America has remained as a major part of international affairs.
The Great Plains were one. They hunted elk, bison, antelope, and etc..
The United States experienced phenomenal economic growth. The war brought the return of prosperity, and in the postwar period the United States consolidated its position as the world's richest country.
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