In reply to God.

You’ve got it very right, although I would argue that history shows the Democratic Party didn’t become the party supported by most poc until the 1930s during the Roosevelt era, and the party was still championed by white supremacists all the way into the 1940s when there was a giant split in the party due to Truman’s support for desegregation of the military. Southern democrats revolted and formed the Dixiecrats, and by the 1960s when LBJ signed Civil Rights legislation into law they left the party in droves when Barry Goldwater, who was anti-civil rights, won the Republican Party nomination. The switch was very gradual but was all but complete by the 1970s.