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The population grew to 29 million in the 1950s from 9 million in the 1930s
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There was also better health care for children and pregnant women during the 1940s-50s
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The birthrate in the U.S. increased tremendously
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Families were growing in order to make up for lost time during the Great Depression and World War 2
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It was either too expensive or too difficult with just parent families to raise children