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Modern demographic transition
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As stated in an article by David Hacker entitled, "Rethinking the "Early" Decline of Marital Fertility in the United States Demography" the Modern Demographic Transition is a rejected theory of the US demographic history that states that mortality in the demographic transition process declined before fertility. The theory states that population growth first increased and then declined generating an inverted-U. The idea behind this theory is that we start out at an equilibrium with high fertility and high mortality then death rates begin falling before birth rates change. The theory claims that this decline in death rates are do to advanced medical treatment and technology, yet it also states that it takes a while for families to catch on to these declining death rates before fertility declines. Ultimately this causes a population explosion. This theory is rejected as a theory of US history because we dont see any period in our demographic history in which population is increasing before it declines. Rather, we observe a stable population growth.
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