September 1 in American History

September 1, 1939 — Germany invades Poland

World War II began in Europe. The U.S. stayed formally neutral for over two more years, but Lend-Lease, the draft, and a rapid military buildup were already reshaping the country before Pearl Harbor made it official. The war that remade the American century started on a day most Americans read about in the paper.

Common Questions

What happened on September 1 in American history?

In 1939: Germany invades Poland. World War II began in Europe.

Why is September 1 significant?

World War II began in Europe. The U.S. stayed formally neutral for over two more years, but Lend-Lease, the draft, and a rapid military buildup were already reshaping the country before Pearl Harbor made it official. The war that remade the American century started on a day most Americans read about in the paper.

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