Every American fighting the Nazis during WWII was a nationalist, white or otherwise. We PRIDED ourselves on it. It helped us win the war. Calling it "white" nationalism is just another devious ploy by the subversive left to try to confuse people into thinking simple national pride and patriotism is somehow RACIST as a means of polarizing the issue and dividing people into groups so they can separate and better attack people and groups.
The Left got the ploy from the Soviets who used it as a form of misinformation to control population.