Th political situation in which opposing political parties find common ground through compromise is called Bipartisanship. It is opposite of Partisanship in which the party adhered to its interests without compromise. There have been many periods of bipartisanship in American politics. In 1960s the Democratic president Johnson was supported by the Democrats and the democrats helped president Reagan in the 1980s.
It started a revolution that showed the world that it was possible to overthrow an empire. It was the beginning of a push for democracy all over the world.