The Wishram and Wasco are Plateau tribes that are closely related and share many cultural aspects of the Northwest Coast tribes. They lived along the banks of the Columbia River, near The Dalles. The Dalles were a prime trading location, and the tribes benefited from a vast trade network. Unfortunately, the 1800s brought non-Indians and European diseases, which took a great toll on the Wasco and Wishram populations. Both tribes were forced by the United States in 1855 to sign treaties ceding the majority of their lands. These treaties established the Warm Springs Reservation.