After the Civil War, the plentiful supply of unskilled labor in the United States a. helped to build the nation into an industrial giant. b. was not a significant force, because industrialization required skilled workers. c. came almost exclusively from rural America. d. increasingly found work in agriculture. e. was almost entirely native born. a. helped to build the nation into an industrial giant. One of the methods by which post-Civil War business leaders increased their profits was

A. Helped to build the nation into an industrial giant.

Explanation:

Unskilled labor, both native-born, and from abroad (mainly immigrants from Europe), helped provide the needed labor force for the booming industry that developed after the Civil War, and that led the United States to become the most industrialized nation in the world by the start of the twentieth century.

However, the industrialization was geographically uneven: it mostly concentrated in the Northeast and the Great Lakes states, while the South continued to be rural, and stagnated economically.

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