The former President Franklin Roosevelt was the 32nd Elected U.S. President and was popular for his termed "Arsenal of democracy" during his one of radio broadcasts in 1940.
Cities like in United States like Detroit, Cleveland, Chicago, New York was termed "Arsenal of democracy" because effort are made in established industrial centers to ensure the support of Allies through supply of many goods and weapons.
Therefore, he termed the United State the "Arsenal of democracy" because of its continued effort in providing support for its allies.
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