(as gemany, my only experienced nation) The nationalist tree is unplayble because the civil war is literally unwinnable unless theres a method to avoid being completely destroyed
theres other focuses directly above the ideolgy you have to do those depending on which your trying to do, traditionalism for monarchy, workers right for communism etc etc
hey i have a tip put ALL no exceptions your troops on an island with no major city and no port then take all the major cities and you automatically win if you don't have an island withouth a port as for military acces to someone and put all you troops on an island without a port that they have