We are all aware that it was Republican Abraham Lincoln's brave belief in freedom and diligent disbelief in secession that freed nearly four million black Americans from slavery. But, it was shortly after Lincoln's death that the Civil Rights Act of 1866, which extended equality legislation to former slaves, was passed by the Republican Congress, overriding the veto by the Unionist-Democrat President Andrew Johnson.
The Civil Rights Act of 1871 gave protection to blacks from the violence of the Ku Klux Klan. This legislation was proposed by Republican Congressman Benjamin Butler and signed into law by Republican President Ulysses S. Grant.
The Civil Rights Act of 1875 gave everyone equal treatment in public accommodations and was proposed by Republican Congressman Butler, once again, and Republican Senator Charles Sumner. It was also signed by Republican President Grant, and though it was mostly ineffective at the time, it became the basis for many of the provisions passed in the 1960s.
The Civil Rights Act of 1957, a voting rights bill, was proposed by Republican President Dwight Eisenhower, but it was dramatically filibustered and drastically amended by Democrats, rendering it largely ineffective for several years.
The ensuing Civil Rights Act of 1960 was a stronger piece of voting rights legislation, and despite continuous filibustering by 18 Democrats, the bill was eventually signed by Republican President Eisenhower.
The famed Civil Rights Act of 1964 aimed for across the board equality and the repeal of Jim Crow laws. The bill was introduced by Democrat President John F. Kennedy in 1963, but it was once again filibustered by Democrats before being revised and passed with the assistance of Republican Senators.
Finally, the Civil Rights Act of 1968, commonly called the Fair Housing Act, prohibited discrimination in buying or renting property, and was signed into law by Democrat President Lyndon Johnson.
(shamelessly stolen from another board ;) )