Answer:
In 1940, President Franklin Roosevelt gave a speech describing the United States as the "arsenal of democracy." At the time, the U.S. had not yet entered World War II, but much of Europe was threatened by Nazi Germany. Roosevelt meant that while the U.S. was not directly fighting in the war at that moment, it would provide essential supplies, weapons, and equipment to support the Allies and the cause of democracy. He wanted to signal that though the U.S. would not immediately send troops, it would provide critical material resources as "the great arsenal of democracy" to help democratic nations resist fascist aggression. By framing the U.S. role this way, Roosevelt hoped to rally public support for aid to the Allies while avoiding direct military involvement for as long as possible. The "arsenal of democracy" phrase highlighted the U.S.'s ability to produce the industrial and military means to bolster democratic forces resisting totalitarianism. Ultimately, the massive supplies the U.S. provided through the Lend-Lease program and other measures helped keep the Allies in the fight until America's formal entry into the war after the attack on Pearl Harbor.