The increase in the birth rate between 1946 and 1964 was owing to the Great Depression and World War II.
Which caused many couples to postpone marriage and many married couples to postpone having children, resulting in a population boom when the economy recovered.
The depression was finally healed by mobilizing the economy for World War I. Millions of men and women enlisted in the military, and even more, went on to lucrative defense professions.
World War II had a major impact on the world and the United States, and it continues to do so now.
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