Question

why did japan importance for America increase significantly​

Answer 1

Answer:

Although Article 9 intended to prevent the country from ever becoming an aggressive military power again, the United States was soon pressuring Japan to rebuild its army as a bulwark against communism in Asia after the Chinese Civil War and the Korean War.

Answer 2

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The U.S.-Japan Alliance is the cornerstone of U.S. security interests in Asia and is fundamental to regional stability and prosperity. ... Because of the two countries' combined economic and diplomatic impact on the world, the U.S.-Japan relationship has become global in scope.