It's hard to understand from other countries but voter ID laws and a lot of voting changes (eg: eliminating voting days and polling places) have been specifically [0] targeted at minority populations and by proxy at the Democratic party. [1] There's a long history of this happening and when the Supreme Court removed a law requiring some states (in the south) with a long history of extremely racist voter suppression to get approval for changes a few years ago there were suddenly large reductions in voting sites, days, and attempts at instating voter ID laws.

[0] As in we have emails where they talk about specifically eliminating Sunday as an early voting day because it's heavily black and disproportionately Democratic.

[1] https://www.snopes.com/fact-check/north-carolina-voter-id/