Economist and demographer Richard Easterlin in his "Twentieth Century American Population Growth" (2000), explains the growth pattern of American population in the 20th century by examining the fertility rate fluctuations and the decreasing mortality rate.
Easterlin, Richard A. "Does Economic Growth Improve the Human Lot?" in Paul A. David and Melvin W. Reder, eds.
He became interested in demography and population studies through his participation as a Research Associate from 1953 to 1955 in the landmark Study of population Redistribution and Economic Growth in the United States conducted by Simon Kuznets and Dorothy Thomas.
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