The transformed the white-dominated political system in the South in the mid-1960s

Civil Rights Act of 1964.

Explanation:

The harsh treatment of the African Americans in the South by the early 1960s including the killing of civil rights activists and violence used against the peaceful protesters had brought the public attention to the gulf between African Americans and their white counterparts. The 1964 Civil Rights Act is a historic federal statute that forbids discrimination on the basis of ethnicity, color, faith, gender, and national origin. It changed the political landscape in the South by providing greater opportunities in employment, educational institutions, and designated areas to the blacks.

legal rights and freedom of speech.i hope that it is correct.

brainliest if correct