By 1967 the emergence of the Black Power movement (1966–75) began to gradually eclipse the original "integrated power" aims of the successful Civil Rights Movement that had been espoused by Martin Luther King Jr. and others. Advocates of Black Power argued for black self-determination, and asserted that the assimilation inherent in integration robs Africans of their common heritage and dignity. For example, the theorist and activist Omali Yeshitela argues that Africans have historically fought to protect their lands, cultures, and freedoms from European colonialists, and that any integration into the society which has stolen another people and their wealth is an act of treason.