According to a data brief released by the Commonwealth Fund, the ACA’s coverage expansions have led to historic reductions in racial disparities in access to health care since 2013, but progress has stalled since 2016. Insurance coverage disparities between white adults and black adults and Hispanics were reduced more in states that expanded Medicaid than in states that did not.
The data brief can be obtained at https://www.commonwealthfund.org/sites/default/files/2020-01/Baumgartner_ACA_racial_ethnic_disparities_db.pdf.