The United States had a population below 140 million when World War II ended in 1945. It would add more than 70 million babies before 1964. At war’s end there had been only one year in the nation’s history when as many as 3 million babies were born. By the early 1950s, annual births were over 4 million and they kept rising into the 1960s. It was not as big a leap in fertility as people often imagine. Sexuality had not been “pent up.” Birth rates had been rising steadily during the war—since 1933, in fact. But over time, high fertility gave those born after the war an extraordinary
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