DeSisto CL, et al. - This inquiry was set up to determine components of excess preterm birth (PTB) rates for U.S.-born black women, compared with both foreign-born black women and U.S.-born white women, attributable to differences in observed sociodemographic, behavioral, and medical risk factors. Findings suggested that the higher rates of PTB among U.S.-born black women vs foreign-born black women and U.S.-born white women may be attenuated via programs and policies that address both distal and proximate factors, including the social determinants of health and the prevention and management of hypertension.