For Native Americans, voting rights were hard-won. Mail-in voting could undo the gains.

While Montana as a state saw record primary turnout on June 2 — more than 389,000 ballots cast, compared with 293,000 in the 2016 primary, according to Montana Public Radio — the three counties with the lowest turnout were all home to Native American tribes including the Crow, Northern Cheyenne, Fort Peck, and Blackfeet. In Blaine County, primary turnout was just 46 percent, compared with 72 to 76 percent in some majority-white counties, according to the Montana Secretary of State’s office. (Williams said she doesn’t currently know whether one or both voting offices will reopen for the November general election, when turnout will surely be higher.)

Read more here.