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Because of the Canal, the U.S. was able to ship supplies so much faster. The faster a country can ship, the more willing they are to trade. They are willing to trade more because they don't have to spend so much money on fuel. Because they spend less money on fuel, they can carry more supplies.
The Postwar Economy: 1945-1960. As the Cold Warunfolded in the decade and a half after World War II, the United States experienced phenomenal economic growth. The war brought the return of prosperity, and in the postwar period the United States consolidated its position as the world's richest country.
I would go with the Answer A. just because I would assume the lower class women would do ANYTHING to get a way of making money.