Question

despite the passage of the civil rights act of 1875, southern states implemented jim crow laws, which were designed to uphold the fifteenth amendment. support the plessy v. ferguson decision. abolish the \separate but equal\ doctrine. prevent african americans from gaining equality.

Explanation:

Jim Crow laws were racial segregation laws in the Southern US. The Fifteenth Amendment gave Black men the right to vote, and Jim Crow laws aimed to restrict Black rights, so they didn't uphold it. The Plessy v. Ferguson decision (which established "separate but equal") was supported by Jim Crow laws, but Jim Crow laws existed before that decision (1896) and their main goal was to keep African Americans from achieving equality, enforcing segregation in all aspects of life. "Abolish 'separate but equal'" is wrong as Jim Crow enforced it. So the correct option is the one about preventing African Americans from gaining equality.

Answer:

prevent African Americans from gaining equality.