21.)Steam power, the growth of railroads, free enterprise, and mass production lead to a decrease in

A. the costs of goods.

B. the number of farms.

C. leisure time.

D. the wages of workers.

1920's

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explanation:

the answer to your question is true

explanation:

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"a shortage of traditional labor created new opportunities in the workplace. a major cause of the internment of japanese americans during world war ii was. racial prejudice. in the early 1940's, the "destroyers-for-military-bases deal" with great britain and the lend-lease act were evidence that the united states."