Even with the Civil Rights Movement and legislation supporting the Fifteenth Amendment, it was widely reported that, throughout the 1950s, 1960s, and early 1970s, many southern states continued practices that prevented African Americans from voting.

The percentage of voters in presidential elections during these years initially declined and then increased slightly. One of the reasons for this behavior in the numbers is due to the Jim Crow laws and the segregation culture that was common in the Southern states during this period. And then, whit the come of the 1980s, these ideas begin to gradually retreat.

Explanation:

US racial segregation laws only began to be repealed as a result of the emergence of civil rights movements and the equality of laws between blacks and whites headed in the 1950s and 1960s by leaders like Martin Luther King Jr., who was notable for their ability to bring large masses of people together in peaceful protests.