Black, Latino and Asian Americans have been key to Georgia’s registered voter growth since 2016

Following Joe Biden’s narrow presidential win in Georgia, early voting is underway in the state’s Jan. 5 runoff election for two U.S. Senate seats, races that will determine whether both chambers of Congress are led by Democrats during the first years of the new administration. Once a reliably Republican state, Georgia has received much attention for the increasing racial and ethnic diversity of eligible voters in the state, which has highlighted the importance of Black voters and other fast-growing groups like Latino and Asian voters.

Black voters in Georgia had...