The long known and the long expected has thus taken place. The forces endeavoring to enslave the entire world now are moving toward this hemisphere. Never before has there been a greater challenge to life, liberty, and civilization. Delay invites greater danger. Rapid and united effort by all the peoples of the world who are determined to remain free will insure a world victory of the forces of justice and of righteousness over the forces of savagery and of barbarism.-President Franklin D. Roosevelt, address to the United States Congress, 1941The address quoted above was likely given in response to which of the following?

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