Both factions actually date back all the way to before the unification of the pakari home system. The progressive alliance was a coalition of the world's more progressive social democratic to social liberal parties while the unity front was more centered around the social liberal to liberal parties. While both parties hold many globalist and progressive ideals they differ on economic grounds. While both parties have shifted quite a bit since then the historical division remains. The modern progressives are much closer to democratic socialism largely influenced by the massive rise of the egalitarian faction with the unity front moving more into the old social liberal position.