This threat is new. America's duty is familiar. Throughout the 20th century, small groups of men seized control of great nations, built armies and arsenals, and set out to dominate the weak and intimidate the world. In each case, their ambitions of cruelty and murder had no limit. In each case, the ambitions of Hitlerism, militarism, and communism were defeated by the will of free peoples, by the strength of great alliances, and by the might of the United States of America.