Imagine what would have happened if Trump had wanted "Welfare Cadillac" to be played for his campaign?
Frankly, people who claim Trump's campaign was unprecedented on this count know little about American political history. Kind of like when some claim today's campaigns are much dirtier than campaigns of old.
Remember the 1988 campaign, in which the HW Bush campaign made it about flag-burning and Willie Horton coming to rape your wife?
Again, you need to define what "divide people" exactly means.