Eastern Shoshone are Shoshone who primarily live in Wyoming and in the northeast corner of the Great Basin where Utah, Idaho and Wyoming meet and are in the Great Basin classification of Indigenous People. They lived in the Rocky Mountains during the 1805 Lewis and Clark Expedition and adopted Plains horse culture in contrast to Western Shoshone that maintained a Great Basin culture. The Eastern Shoshone primarily settled on the Wind River Indian Reservation in Wyoming, after their leader, Washakie signed the Fort Bridger Treaty in 1868.