To mark the 150th anniversary of the Fort Laramie peace treaty between the Sioux nation and US government, the Lakota people rode 400 miles from Green Grass in South Dakota, home to their spiritual leader, Arvol Lookinghorse, to Fort Laramie in Wyoming, where the treaty was signed.

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Roderick Dupris of the Cheyenne River reservation and other Fort Laramie treaty riders in Torrington, Wyoming

Photograph: Stephanie Keith/Reuters

A horse is decorated with a handprint before heading into the town of Fort Laramie. Horses were traditionally painted before battle to bless the horse and its rider

Tatanka Itancan Lone Eagle hugs his horse at the end of the day in Scenic, South Dakota

Two people put up a teepee in Fort Robinson, Nebraska. The raising of teepees along the ride was unusual. People usually sleep either in the back of a horse trailer, in their car, tent, community center or motel

Stephanie Big Eagle rides along Bombing Range Road on the Pine Ridge reservation near Scenic, South Dakota

Harold Frazier, chairman of the Cheyenne River reservation wears his Lakota headdress and holds a staff

Austin Warrior, 11, and his sister Delores Warrior, 19 months, both from Pine Ridge reservation, are covered with burning sage smoke in Harrison, Nebraska. Riders and horses gather in a circle at dawn and dusk to be ‘smudged’

Beatrice Lookinghorse sits with two of her grandchildren in the backyard of her home on the Cheyenne River reservation in Green Grass

Angel Rose Lookinghorse sits with her cousins as she speaks to her brother Jayden on the Cheyenne River reservation in Green Grass