Southern Democrats, historically sometimes known colloquially as Dixiecrats, are members of the U.S. Democratic Party who reside in the Southern United States. Southern Democrats were generally much more conservative than Northern Democrats with most of them voting against the Civil Rights Act of 1964 by holding the longest filibuster in American Senate history while Democrats in non-Southern states supported the Civil Rights Act of 1964. After 1994 the Republicans typically won most elections in the South. In the 19th century, Southern Democrats were people in the South who believed in Jacksonian democracy. In the 19th century, they defended slavery in the United States, and promoted its expansion into the West against northern Free Soil opposition. The United States presidential election of 1860 formalized the split in the Democratic Party and brought about the American Civil War. Stephen Douglas was the candidate for the Northern Democratic Party, and John C. Breckinridge represented the Southern Democratic Party. Abraham Lincoln, who opposed slavery, was the Republican Party candidate. After Reconstruction ended in the late 1870s so-called redeemers controlled all the Southern states and disenfranchised Blacks. The "Solid South" gave nearly all its electoral votes to the Democrats in presidential elections. Republicans seldom were elected to office outside some Appalachian mountain districts and a few heavily German-American counties of Texas. The monopoly that the Democratic Party held over most of the South first showed major signs of breaking apart in 1948, when many White Southern Democrats, upset by the policies of desegregation enacted during the administration of Democratic President Harry Truman, created the States Rights Democratic Party. This new party, commonly referred to as the "Dixiecrats", nominated South Carolina Governor Strom Thurmond for president. The Dixiecrats won most of the deep South, where Truman was not on the ballot. The new party collapsed after the election, while Thurmond became a Republican in the 1960s. President Lyndon B. Johnson, although a southern Democrat himself, signed the Civil Rights Act of 1964 and Voting Rights Act of 1965. The evening after signing the Civil Rights Act, Johnson told aide Bill Moyers, "I think we may have lost the south for your lifetime – and mine", anticipating a coming backlash from Southern whites against Johnson's Democratic Party. As Johnson anticipated, this led to heavy opposition from Southern Democrats. However, the Democratic Party had a supermajority in the Senate with 46 of their members joining the Republican Party