Since 1970, increase in annual number of U.S. 1970, births is driven entirely by immigrant women Annual number of U.S. births, by mother's nativity (millions)
The share of births outside of marriage declined for immigrant women from 2008 to 2014, but held steady for U.S.-born women. Immigrant women play an important role in overall U.S. fertility trends. Between 1970 and 2014, the increase in the annual number of U.S. births was driven entirely by immigrant women, while births to U.S.-born women fell. The important role of immigrant women in driving U.S. births stems from both the growth in the foreign-born population and the fact that immigrant women have, on average, more children than U.S.-born women.
Since 1970, increase in annual number  | of U.S. 1970, births is driven entirely by  | immigrant women  | Annual number of U.S. births, by mother's nativity  | (millions)  | Total  | U.S. born  | Foreign born  | Although annual births  | annual births  | overall driving an  | Although annual births to  | to foreign born  | overall driving  | U.S. born  | women have  | increase in  | annual births  | women have  | increased  | decreased  | since 1970  | 4.00  | 3.74  | 3.46  | 3.10  | 0.90  | 0.27  | 1970  | 2014  | 1970  | 2014  | 1970  | 2014  | Source: Pew Research Center analysis of Nations Center forHealth  | Statistics data  | "Births outside of marriage declinefor immigrantwwmmen"  | PEW RESEARCH CENTER 