German/Americans were not interned unless they were members of the "German/American Bund", a pro-Nazi organization:

With the start of World War II most of the Bund's members were placed in internment camps, and some were deported at the end of the war.

en.wikipedia.org/wiki/Germ...rican_Bund

Unlike the Japanese, German/Americans were not interned because of race or national origin, but only on the basis of political allegiance. The great majority remained loyal to the United States, and many fought on the U.S. side during the war. If they were deported during the war, it's the first I've heard of it.

I grew up above the Green River valley in Western Washington. The valley was populated by Japanese and Filipino truck farmers. My grandmother talked until her death in 1999 of the japanese getting together and talking in their own language. My mother was just a toddler during the war and she still talks of Japanese internment with uncritical necessity. So..., It is no surprise that German internment is a non-starter. I have brought up the subject of German internment in casual conversation and no one believes that it happened and challenge me on the possibility of its historical reality. In a sense there is a terrible inverted parallel to the internment of nationals by the Nazis. The Jews get all the press, the other groups the short shrift. Yet, if anyone denies the holocaust they are promptly dealt with; and if anyone attempts to talk of anyone else but Japanese being interned in the US then they are marginalized. Time will certainly level the factual playing field, but there is no reason to make that moment now, especially with the availability of information now.