Other than the census, tax returns, birth certificates, drivers licences? Or are you looking for ways the governments in the U.S. are specifically using this d

Other than the census, tax returns, birth certificates, drivers licences? Or are you looking for ways the governments in the U.S. are specifically using this data such as : https://siliconvalleyindicators.org/special-reports/population-brief-may-2015/total-population-and-women-of-childbearing-age-2005-2025/ https://siliconvalleyindicators.org/special-reports/populati... or https://www.census.gov/newsroom/cspan/childbearing/20120817_cspan_childbearing_slides.pdf https://www.census.gov/newsroom/cspan/childbearing/20120817_...