Which political party - during the 1960s - became the party associated with defending civil rights and ending segregation?

The civil rights movement was a struggle by African Americans in the mid-1950s to late 1960s to achieve civil rights equal to those of whites, including equal opportunity in employment, housing, and education, as well as the right to vote, the right of equal access to public facilities, and the right to be free of racial discrimination. No social or political movement of the twentieth century has had as profound an effect on the legal and political institutions of the United States. This movement sought to restore to African Americans the rights of citizenship guaranteed by the Fourteenth and Fifteenth Amendments, which had been eroded by segregationist jim crow laws in the South. It fundamentally altered relations between the federal government and the states, as the federal government was forced many times to enforce its laws and protect the rights of African American citizens. The civil rights movement also spurred the reemergence of the judiciary, including the Supreme Court, in its role as protector of individual liberties against majority power. In addition, as the Reverend Martin Luther King Jr, and other leaders of the movement predicted, the movement prompted gains not only for African Americans but also for women, persons with disabilities, and many others.

The civil rights movement has been called the Second Reconstruction, in reference to the Reconstruction imposed upon the South following the Civil War. During this period, the fourteenth amendment (1868) - granting equal protection of the laws-and fifteenth amendment (1870) - giving the right to vote to all males regardless of race-were ratified, and troops from the North occupied the South from 1865 to 1877 to enforce the abolition of slavery. However, with the end of Reconstruction in 1877, southern whites again took control of the South, passing a variety of laws that discriminated on the basis of race. These were called Jim Crow laws, or the black codes. They segregated whites and blacks in education, housing, and the use of public and private facilities such as restaurants, trains, and rest rooms; they also denied blacks the right to vote, to move freely, and to marry whites. Myriad other prejudicial and discriminatory practices were committed as well, from routine denial of the right to a fair trial to outright murder by lynching. These laws and practices were a reality of U. S. life well into the twentieth century.