Complete the following sentence: By the late 1960s, spurred in part by the increasingly leftward tilt of national Democrats, conservative whites began to vote for Republican national candidates and gradually for more Republicans locally. <unk> <unk> <unk>
Greensboro Sit-ins<unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk>