Chairman of the Cheyenne River Reservation, Harold Frazier (center) wears his traditional head dress prior to arriving in Fort Laramie later that day near Fort Laramie, Wyoming on April 27, 2018. REUTERS/Stephanie Keith

Chairman of the Cheyenne River Reservation, Harold Frazier (center) wears his traditional head dress prior to arriving in Fort Laramie later that day near Fort Laramie, Wyoming on April 27, 2018. REUTERS/Stephanie Keith

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Jayden Lookinghorse riding his horse stands on top of a hill at Arvol Lookinghorse's home on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

Jayden Lookinghorse riding his horse stands on top of a hill at Arvol Lookinghorse's home on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

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A herd of horses run through a river at Arvol Lookinghorse's home on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

A herd of horses run through a river at Arvol Lookinghorse's home on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

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A group of the Fort Laramie treaty riders head out in the morning along the local highway on the Cheyenne River Reservation outside of Bridger, South Dakota on April 16, 2018. REUTERS/Stephanie Keith

A group of the Fort Laramie treaty riders head out in the morning along the local highway on the Cheyenne River Reservation outside of Bridger, South Dakota on April 16, 2018. REUTERS/Stephanie Keith

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A Fort Laramie treaty rider, Austin Warrior, age 11, and his sister Delores Warrior, 19 months, both from Pine Ridge Reservation are covered with burning sage smoke in Harrison, Nebraska on April 24, 2018.

A Fort Laramie treaty rider, Austin Warrior, age 11, and his sister Delores Warrior, 19 months, both from Pine Ridge Reservation are covered with burning sage smoke in Harrison, Nebraska on April 24, 2018.

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Tatanka Itancan Lone Eagle, age 15, from Bridger on the Cheyenne River Reservation, hugs his horse at the end of the day during the Fort Laramie treaty ride in Scenic, South Dakota on April 19, 2018. REUTERS/Stephanie Keith

Tatanka Itancan Lone Eagle, age 15, from Bridger on the Cheyenne River Reservation, hugs his horse at the end of the day during the Fort Laramie treaty ride in Scenic, South Dakota on April 19, 2018. REUTERS/Stephanie Keith

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Four people await the arrival of the Fort Laramie treaty riders for a rest stop near Harrison, Nebraska on April 24, 2018. REUTERS/Stephanie Keith

Four people await the arrival of the Fort Laramie treaty riders for a rest stop near Harrison, Nebraska on April 24, 2018. REUTERS/Stephanie Keith

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The Fort Laramie treaty riders ride along Van Tassel Road in Torrington, Wyoming on April 26, 2018. REUTERS/Stephanie Keith

The Fort Laramie treaty riders ride along Van Tassel Road in Torrington, Wyoming on April 26, 2018. REUTERS/Stephanie Keith

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Duane Blindman, age 64, Oglala tribe, from Slim Buttes on the Pine Ridge Indian Reservation poses for a photograph in Van Tassel, Wyoming on April 25, 2018. REUTERS/Stephanie Keith

Duane Blindman, age 64, Oglala tribe, from Slim Buttes on the Pine Ridge Indian Reservation poses for a photograph in Van Tassel, Wyoming on April 25, 2018. REUTERS/Stephanie Keith

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The Fort Laramie treaty riders circle up after their day of riding in Harrison, Nebraska on April 24, 2018. REUTERS/Stephanie Keith

The Fort Laramie treaty riders circle up after their day of riding in Harrison, Nebraska on April 24, 2018. REUTERS/Stephanie Keith

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Dave Swallow or "Man Who Walks with Pride" an elder and headsman of the Oglala Lakota Nation gathers with others on the Pine Ridge Reservation to discuss treaties and the treaty ride in Pine Ridge, South Dakota on April 22, 2018. REUTERS/Stephanie Keith

 Dave Swallow or "Man Who Walks with Pride" an elder and headsman of the Oglala Lakota Nation gathers with others on the Pine Ridge Reservation to discuss treaties and the treaty ride in Pine Ridge, South Dakota on April 22, 2018. REUTERS/Stephanie Keith

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The Fort Laramie treaty riders come off the trail and ride past a housing cluster on the Pine Ridge Reservation just as the sun is setting in Oglala, South Dakota on April 21, 2018. REUTERS/Stephanie Keith

The Fort Laramie treaty riders come off the trail and ride past a housing cluster on the Pine Ridge Reservation just as the sun is setting in Oglala, South Dakota on April 21, 2018. REUTERS/Stephanie Keith

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The "tribal area" is seen at sunset on the grounds of the Fort Laramie National Historic Site in Fort Laramie, Wyoming on April 28, 2018. REUTERS/Stephanie Keith

The "tribal area" is seen at sunset on the grounds of the Fort Laramie National Historic Site in Fort Laramie, Wyoming on April 28, 2018. REUTERS/Stephanie Keith

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Seth Eastman from the Sisseton-Wahpeton Sioux Tribe sleeps in the back of a truck in the "tribal area" on the grounds of the Fort Laramie National Historic Site in Fort Laramie, Wyoming on April 29, 2018. REUTERS/Stephanie Keith

Seth Eastman from the Sisseton-Wahpeton Sioux Tribe sleeps in the back of a truck in the "tribal area" on the grounds of the Fort Laramie National Historic Site in Fort Laramie, Wyoming on April 29, 2018. REUTERS/Stephanie Keith

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Participants in the conference called "Honoring the Spirit" that commemorates the 150th anniversary of the Fort Laramie treaty listen to speakers at the Fort Laramie National Historic Site in Fort Laramie, Wyoming on April 28, 2018. REUTERS/Stephanie Keit

Participants in the conference called "Honoring the Spirit" that commemorates the 150th anniversary of the Fort Laramie treaty listen to speakers at the Fort Laramie National Historic Site in Fort Laramie, Wyoming on April 28, 2018. REUTERS/Stephanie Keith

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One of Arvol Lookinghorse's horses, ridden by the Fort Laramie treaty riders, is put in a horse trailer for transport back to Green Grass, South Dakota in the "tribal area" on the grounds of the Fort Laramie National Historic Site in Fort Laramie, Wyoming

One of Arvol Lookinghorse's horses, ridden by the Fort Laramie treaty riders, is put in a horse trailer for transport back to Green Grass, South Dakota in the "tribal area" on the grounds of the Fort Laramie National Historic Site in Fort Laramie, Wyoming on April 29, 2018. REUTERS/Stephanie Keith

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People sit in front of a mural depicting a Buffalo and a traditional looking Native along the main road on the Cheyenne River Reservation in Eagle Butte, South Dakota on May 28, 2018. REUTERS/Stephanie Keith

People sit in front of a mural depicting a Buffalo and a traditional looking Native along the main road on the Cheyenne River Reservation in Eagle Butte, South Dakota on May 28, 2018. REUTERS/Stephanie Keith

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One of Beatrice Lookinghorse's grand daughters rides a horse around her home on the Cheyenne River Reservation in Green Grass, South Dakota on May 29, 2018. REUTERS/Stephanie Keith

One of Beatrice Lookinghorse's grand daughters rides a horse around her home on the Cheyenne River Reservation in Green Grass, South Dakota on May 29, 2018. REUTERS/Stephanie Keith

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Angel Lookinghorse, sitting with her younger cousins, speaks to her brother, Jayden Lookinghorse riding his horse, on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

Angel Lookinghorse, sitting with her younger cousins, speaks to her brother, Jayden Lookinghorse riding his horse, on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

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Mahto In The Woods jumps over a small creek while his cousin Jayden Lookinghorse jumps over the creek on his horse on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

Mahto In The Woods jumps over a small creek while his cousin Jayden Lookinghorse jumps over the creek on his horse on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

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Beatrice Lookinghorse sits with two of her grandchildren in the backyard at her home on the Cheyenne River Reservation in Green Grass, South Dakota on May 28, 2018. REUTERS/Stephanie Keith

Beatrice Lookinghorse sits with two of her grandchildren in the backyard at her home on the Cheyenne River Reservation in Green Grass, South Dakota on May 28, 2018. REUTERS/Stephanie Keith

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One of Beatrice Lookinghorse's grand daughters plays in the backyard of Beatrice Lookinghorse's trailer on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

One of Beatrice Lookinghorse's grand daughters plays in the backyard of Beatrice Lookinghorse's trailer on the Cheyenne River Reservation in Green Grass, South Dakota on May 30, 2018. REUTERS/Stephanie Keith

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