Current demographic changes in the United States closely follow those posited by the "second demographic transition" (SDT) theory. Characteristics such as rises in premarital cohabitation and in ...

This allows the accurate measurement of number of grandchildren born and resulted in a representative sample of individuals living both before and after the demographic transition (Table 1).

BACKGROUND According to classic demographic transition theory, mortality change is the key factor that triggers a decline in fertility. Research on this topic has mostly relied on aggregate or time ...