Question

The post-world war ll baby boom was caused in part by

Answer 1

 postponed marriage and childbirth during the Great Depression and World War II, were joined in the nation's maternity wards by young adults who were eager to start families.

Answer 2

The late 1940s and the 1950s brought low desires to have material objects, because of the Great Depression and World War II, as well as plentiful job opportunities (being a post-war period). These two factors gaverise to a high relative income, which encouraged high fertility. Hence Baby Boom.