After the Second World War, why did American planners seek a world economy based on free trade and the quick reconstruction of Germany, Japan, and other nations?

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American planners believed that after the devastation of World War II, the economic well-being and security of the United States depended on the quick reconstruction of Germany, Japan, and other nations, as well as the establishment of a world economy based on free trade. They believed this would prevent the emergence of new world wars and promote economic growth, which in turn would benefit the United States.

After the Second World War, Why Did American Planners Seek