In the twentieth century, there were two major realignments in party loyalty involving race (that is, two time periods during which a sector of the U.S. population moved from one political party to the other). What were those two major changes, and in what context did each of them take place? Be clear that the question is about the twentieth century, and is about two distinct time periods and situations.

In the twentieth century, there were two major realignments in party loyalty involving race (that is, two time periods during which a sector of the U.S. population moved from one political party to the other). What were those two major changes, and in what context did each of them take place? Be clear that the question is about the twentieth century, and is about two distinct time periods and situations.