George Friedman of Stratfor lays out the arguments for nationalism. Liberalism begins with the right of national self-determination. Unless you have a nation in which you have can exercise civil liberties, you do not have civil liberties, you only have empires. Nationalism is not the opposition to liberalism, it is the expression of liberalism. If you do not believe in nationalism, you do not believe in liberalism.
I observe that Friedman is now saying what Bannon is saying. Nations are fighting for their existence and relevance against worldly technocratic elites. If you take away the consent of the governed, you take away liberalism. Nationalism is liberalism.
The contrary view leads to pan-national empires, which are an older way of organizing societies without the consent of the governed. This doctrine used to be peddled by Joe Clark, the former Canadian conservative leader, in the following form: Canada was a “community of communities”, and not a nation. Such societies could only be governed by panels of technocratic experts.