On 15 January 1838, the United States government entered into the Treaty of Buffalo Creek, with nine Indian nations of New York, including the Seneca. The treaty was part of the United States Indian Removal program, by which they persuaded or forced Native American peoples from eastern states to move west of the Mississippi River to lands reserved for them in the large Kansas Territory. This displaced peoples native to those areas. The US wanted the Seneca and other New York tribes to move there to free up lands in New York for European-American settlement. Under the treaty, the US acknowledged that the Ogden Land Company was going to buy the four remaining Seneca reservations in New York. The proceeds would be used to pay for the nation's removal to Kansas Territory. The US modified the 1838 treaty by the "Treaty with the Seneca of 1842". The new treaty reflected that the Ogden Land Company had purchased only two reservations, including the Tonawanda Reservation. The Seneca retained the Cattaraugus and Allegany reservations. At this time, the Seneca of the Tonawanda Reservation protested they had not been consulted on either treaty, nor had their chiefs signed either treaty. They refused to leave their reservation. In 1848, the Seneca Indians of the Cattaraugus and Allegany reservations held a constitutional convention. They adopted a new form of constitution and government modeled on that of the United States, including tribal popular election of chiefs. Traditionally, hereditary chiefs were selected by clan mothers and ruled for life The Tonawanda Band did not want to make such changes, and seceded from the main Seneca nation in New York. They reorganized and re-established their traditional government with a council of chiefs representing each of their eight clans. In 1857, under the "Treaty with the Seneca, Tonawanda Band", the Tonawanda Band of Seneca Indians secured federal recognition as an independent Indian nation. With their share of proceeds from the earlier land sale, they bought back most of the Tonawanda Reservation. Under their traditional government, hereditary chiefs typically served for life. They governed by a consensus of leaders of the clans, which formed the basis of the band. The Seneca and all the Iroquois peoples had a matrilinealkinship system, in which descent and property were passed through the maternal line. Children were considered born into the mother's clan and took their status from her people.
"The Tonawanda Band consists of eight 'clans': the Snipe, the Heron, the Hawk, the Deer, the Wolf, the Beaver, the Bear, and the Turtle. Each clan appoints a clan mother, who in turn appoints an individual to serve as Chief . The clan mother retains the power to remove a Chief and, in consultation with members of the clan, provides recommendations to the Chief on matters of tribal government. The clan mothers cannot disregard the views of the clan, nor can the Chiefs disregard the recommendations of the clan mothers."