How did non-material factors, such as a government’s foreign policy successes or failures, also affect the stability of the regime in question?

Four distinct political systems unfolded in Germany from 1919 to 1990: the Weimar Republic, the Third Reich, the Federal Republic of Germany, and the German Democratic Republic. To what extent was the stability of each regime determined by its ability to fulfill basic consumer demands? How did non-material factors, such as a government’s foreign policy successes or failures, also affect the stability of the regime in question?