For some it is, and for others it's not. Depends on where you want to apply it. Nazi Germany believed National Socialism to be the natural support structure for a single race society. Israel shares that belief for their own country. Not only has Israel declared themselves to be a Jewish state, they also provide government benefits and other laws that support Jews only, and an immigration system that allows only Jews to become citizens of Israel.

But for a multicultural state like the US, National Socialism is impossible if you look at it from the same point of view as Nazi Germany and Israel. There simply is no one race or culture that would allow National Socialism to succeed.