Allie Redhorse Young stood in the back of a truck in the Navajo Nation community of Fort Defiance and introduced actors Mark Ruffalo and Wilmer Valderrama to community members before they all ventured off on a three-mile walk to the nearest polling box to mail off their early voting ballots.

The Poor Things actor joined “Walk to the Polls,” an event created by Protect the Sacred founder and Navajo activist Allie Redhorse Young. The 3-mile walk celebrated 100 years of Native American citizenship in the U.S. and honored the Navajo Long Walk, when the tribe was forcibly removed from its homelands in the 1860s.

"It's a commemoration of the long struggle, the resilience, and resistance, and beauty of this culture," Ruffalo tells PEOPLE