The National Center for Health Statistics recently released a report, “The U.S. National Vital Statistics System: Transitioning Into the 21st Century, 1990–2017: Programs and Collection Procedures”, that highlights changes to the National Vital Statistics System. This system contains data, publications, and other resources that represent a variety of jurisdictions responsible for registering vital events (e.g. births, marriages, deaths, fetal deaths, and divorces) throughout the nation.
The report is available for downloading from NCHS (Vital and Health Statistics, Series 1, Number 62, March 2018, .pdf format, 74 pages). See: https://www.cdc.gov/nchs/data/series/sr_01/sr01_062.pdf