The Dawes Act (also known as the General Allotment Act), signed by President Grover Cleveland on February 8, 1887, authorized the division of communally held Native American tribal lands into individual allotments. The Act provided 160 acres to each head of family and smaller parcels to others, with the aim of assimilating Native Americans into American society through private land ownership. "Surplus" lands were sold to non-Native settlers, resulting in Native Americans losing approximately 90 million acres (about two-thirds of their land base) by 1934 when the policy was reversed.