SANTA FE, N.M. (AP) — Voter participation advocate Theresa Pasqual traverses Acoma Pueblo with a stack of sample ballots in her car and applications for absentee ballots, handing them out at every opportunity ahead of New Mexico’s Tuesday primary.

Residents of the tribal community’s original mesa-top “sky city” that endured after the Spanish invasion in the late 1500s know firsthand the challenges voters have faced across Indian Country, where polling places are often hours away and restrictive voter laws and ID requirements only add to the barriers.

It’s been a century now since an act of Congress granted citizenship to Native Americans, but advocates say that right bestowed in 1924 still hasn’t translated into equal access to the ballot. Inequities are especially pronounced in remote regions across the U.S., and some key Southwestern states with large Native American populations.