Eisenhower policy of "assimilation" led to adoption

...In 1950, under the Eisenhower policy of "Assimilation" of Native American Tribes, the Gabrielino-Tongva were effectively terminated. The Mexican-American War was settled by the Treaty of Guadalupe, which ceded California to the United States. ... The Eisenhower policy of "assimilation" also lead to the adoption of over 50,000 Native American children into white, often suburban households (until the practice was ended by the Indian Child Welfare Act of 1978).

[website: http://www.gabrielinotribe.org/TribalHistory/tribal_history.cfm]