Yes, nativism is a favored polemic of white supremacists. It would be silly to test the American "faith," character or citizenship, by any other psychometric but profit motive.

Diversity is the key to economic and political evolution.

I'd say third rather than second generation. You definitely get a different perspective if you're brought up by parents who immigrated as adults. When the language and culture of the home you grow up in is not-American, that affects you and your identity. This is true even if as is often the case, you grow up mono or one-and a half lingual (I was the only American born kid among our Polish friends who spoke Polish fluently. The rest either didn't know it at all, or generally spoke English while their parents spoke Polish. This pattern seems quite common among Asians of my generation as well.)