In Montana, where Native American women make up about 3 percent of the overall population, they made up about 6 percent of homicide victims between 2011 and 2015, according to the Montana Department of Public Health and Human Services' 2015 vital statistics report.

White women make up about 44.5 percent of Montana's population, but accounted for about 21 percent of homicide victimes between 2011 and 2015.

Sunday Plant, who marched with GrowingThunder Monday, said she has known at least two women in her family who were murdered.

Plant's eldest daughter, now attending college in New Mexico, is friends with GrowingThunder. Plant said she was walking in part for her.

"I called her after the second day, and said, 'Well you know, I did two days,'" Plant said. "She said, 'Well, you can push through.'"

Raising her two daughters, the fear of violence against them was never far from her mind, Plant said. When her eldest daughter left for college, she made her get GPS on her phone. "So I'd always know where she was," Plant said.

Briana Lamb, 28, walked with her dog, Benny. Lamb has followed what Canada has done in the past year to try to better understand and address the death and disappearances of the country's indigenous women.