Which factor contributed to the growth of the U. S. economy during the 20th century?
O A. The United States became an industrial leader.
B. The United States suffered heavy losses in World War I.
C. The United States cut off trade with foreign countries.
D. The United States continued to use the gold standard

A

Explanation:

discovery of cape town-portuguese empire

development of africans language-dutch east india company

introduction of railway-british empire

monopolies  came to the united states with the colonial administration. the large-scale public works needed to make the new world hospitable to old world immigrants required large companies to carry them out. these companies were granted exclusive contracts for these works by the colonial administrators. even after the american revolution, many of these colonial holdovers still functioned due to the contracts and land

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