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The United States became the dominant super-power of the 20th century because of its industrial might, its technological excellence, and the character of its people and leadership. Facing first the military challenge of the Soviet Union and then that of China, the United States continued to maintain and develop its military strength while also pursuing a course of careful diplomacy. While these challenges and others have not yet been entirely overcome, the United States continues to stand as a super-power in the 21st century.

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