While initially hospitable to the region's newcomers, Joseph the Elder grew wary when white settlers demanded more Indian lands. Tensions grew as the settlers appropriated traditional Indian lands for farming and grazing livestock. Isaac Stevens, governor of the Washington Territory, organized a council to designate separate areas for natives and settlers in 1855. Joseph the Elder and the other Nez Perce chiefs signed the Treaty of Walla Walla, with the United States establishing a Nez Perce reservation encompassing 7,700,000 acres (31,000 km) in present-day Idaho, Oregon, and Washington. The 1855 reservation maintained much of the traditional Nez Perce lands, including Joseph's Wallowa Valley. It is recorded that the elder Joseph requested that Young Joseph protect their 7.7-million-acre homeland, and guard his father's burial place.