In the United States since 1920,many situations have changed because of the move to urban areas.What is one of these changes?

Question

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The figure shows a graph of total employment in the United States by industry from 1920 to 2000. The largest increase in employment occurred in the service industry, which includes better working conditions compared to industries such as agriculture and manufacturing. Therefore, one of the changes that occurred because of the move to urban areas was better working conditions. The other options (substandard housing, increased incidence of infectious diseases, increased water quality problems, poorer air quality) are not supported by the information in the graph.

In the United States Since 1920,many Situations Have Changed Because