You need to differentiate two senses of "liberal" and "conservative." One sense is relative to time and culture, which is the way you seem to be using it. It's not wrong and is meaningful when you are considering politics within a particular time and place. We could consider 1860s U.S. Republicans to be "liberal" in the context of their time and place and 1960s Southern Democrats to be "conservative" in the context of their time and place. The other sense of the political terms is about enduring social values about the concentrations (conservative) or circulation (liberal) of power. In that sense, Republicans and southern Democrats have always been conservative and Northern Democrats were liberal from 1932 to 1992 and conservative the rest of the time.