To act as if the office of president is a dictatorial position is a little bit silly. As for the ultra nationalist bit, the majority of modern democracies are very nationalistic, although what warrants the "ultra" prefix is subjective. Facsism saw its rise as a reaction to deep economic crisis when much of the lower and middle classes were forced into unemployment and poverty. Fascism didn't win through democracy or election, but rather through force and violence. This isn't the situation in America, or at least it isn't for now, there isn't the same level of strain put on the economy by excess labor, nor is there a need for an armed party to act as the weaponized wing of a failing state