Whats the answer will mark bl

Describe the factors that led to the truman doctrine as well as how the doctrine affected the us foreign policy

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Which of the following describes an effect of world war ll on the united states economy a. automobile companies produced a record number of cars b. many factories had to expand to produce military equipment c. the airplane industry suffered as the allies began using airplanes in combat d. cities with shipyards declined because so many ships had been sent overseas.