At its peak in 1957, the U.S. boom hit 3.7 children per family, nearly half a baby fewer than 3 Canadian women were producing at the peak of the Canadian boom. The Americans started their boom earlier because more of their war effort was in the Pacific, and the Pacific war wound down sooner. The U.S. troops were brought home 3s in 1945, and kids started appearing in 1946. Canadian troops came home later, so Canadian births did not leap upward until 1947. As for the Australians, they never got much higher than three babies per woman, but they compensated 40 by continuing their boom ten years longer than Canada did. That happened because Australians were slower to adopt the birth control pill and because Australian women were slower than their North American counterparts to enter the workforce in large numbers.