Turner's Frontier Thesis · US History

How did the Frontier Thesis influence U.S. foreign policy at the turn of the 20th century?

  1. It justified American imperialism and the search for new overseas markets
  2. It led to a policy of strict isolationism
  3. It caused the U.S. to give up Alaska and Hawaii
  4. It forced the U.S. to join the League of Nations far earlier than planned
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Correct answer: It justified American imperialism and the search for new overseas markets

If the frontier was the source of American strength and it was now closed, many leaders argued that the U.S. needed to find 'new frontiers' in the Pacific and Caribbean to maintain its national vitality and economic growth.

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