Black Power is a political ideology that originated in the late 1960s and early 1970s, aiming to achieve self-determination for people of African descent. The movement originated as a movement in the 1960s, and it was developed into a coherent ideology by Stokely Carmichael and Charles V. Hamilton in their book Black Power in 1969. The movement called upon African-Americans to take pride in their culture and their descent, to exhibit a greater sense of solidarity and community in order to creat a distinctively black economic political base that would allow for African-Americans to achieve full equality in US society. Organizations associated with the Black Power movement, such as SNCC and the Congress of Racial Equality, were instrumental in the movement's original aim of integration. Increasingly violent language on the part of Balck Power leaders led many whites to turn against the Civil Rights movement in the "white backlash" of the late 1960s and 1970s, and the majority of Americans reacted negatively to the organizations associated with the Black Power ideology, especially the militant Black Panther Party. Black Power was opposed by the leaders and members of the Civil Rights movement (such as Martin Luther King, Jr.) and the National Urban League. The significance and increase in the cultural awareness among many African-Americans which the Black Power movement produced contrasted with increasing income differentials among African-Americans and the development of a substantial African-American middle class. Black solidarity remained a problematic issue among black intellectuals and the larger community. During the 2010s, the Black Power movement re-emerged as the result of a series of police killings of unarmed black men, and the Black Lives Matter movement was associated with it.