Which explains how the treaty at the Walla Walla Council affected the Nez Perce? They moved onto a small reservation and gave up the right to live in different places based on the season. They were forced to live in different places based on the season and gave up their small reservation O They gave up a large portion of their land to the Yakama Nation and moved onto a small reservation They moved onto a small reservation and thrived under assimilation by the federal government.