https://jacksonholehistory.org/an-introduction-to-the-wind-river-indian-reservation-of-wyoming/ 

The Eastern Shoshone and Northern Arapaho tribes have separate governments organized under the auspices of the General Councils of each tribe. The administrative arm of each tribe is the tribal business council (the ESBC and NABC). General Council members are all enrolled tribal members who are 18 years old or older. The General Council retains sovereignty for each tribe, but delegates many decisions for day-to-day activities to their respective business councils. Business Council members are elected to fixed terms of office. Each tribe has separate departments, such as housing, employment, social services, and the like. Until late 2014, the Joint Business Council (JBC) operated to attend to reservation matters that affected both tribes. Both Tribes now operate under the Wind River Inter tribal Council

Cultural traditions and ceremonies once banned by the government are now celebrated and encouraged These include rituals such as the sweat lodge, Sun Dance, Ghost Dance, and the Native American Church. Beadworking, powwow dancing, and other traditional practices continue to thrive to the delight of tribal members and non-tribal visitors alike. Both tribes are attempting to preserve their native language.

While older traditions and customs are preserved, practiced, and celebrated,  Eastern Shoshone and Northern Arapahos also participate in the larger American consumer world. Cell phones are carried in ornately beaded bags—or simply stuffed into jeans pockets. Ranching and farmwork provide employment both on and off the reservation. Others own construction businesses. Many are college educated with professional careers. Like Americans everywhere, Shoshones and Arapahos own homes, rent houses or apartments, and drive trucks and cars. Many still own and ride horses. Thus, “walking in two worlds”—living with respect for elders and traditions of the past go hand-in-hand with living lives of modernity.