The Importance and Effects of U.S. Involvement in World War I and II Only about two hundred years old, the United States had developed into a major world power by the beginning of the 20th Century. The 1900's marked the beginning of a drastic change in the economy, communications and technologies. The world was in constant change. July 28, 1914 was a date that would change the world forever. ...

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• Approx Pages: 15
• Grade Level: High School