Fertility rates are births per 1,000 women aged 15-44 years. The 2013 U.S. fertility rate was the lowest ever recorded, going back to 1920. 2007 was a recent peak in fertility.
(CPAR), Center for Public Affairs Research, "Fertility Rate for All Races by State: 2007 final versus 2013 final" (2013). Publications since 2000. 410.