Internment of German Americans - Wikipedia, the free ...
https://en.wikipedia.org/.../Internment_of_German_Americans
Wikipedia
Jump to World War II - In the 1940 US census, some 1,237,000 persons identified as being ... becoming naturalized United States citizens and many did so. The large number of German Americans of recent connection to Germany, and their ... A total of 11,507 people of German ancestry were interned during the war.
1,237,000 not 12 million.
Read my post again and then read Wiki again. Eleven million people had one or both parents born in Germany, the German equivalent of a Nisei. Fewer than 12,000 were interned compared to over 100,000 from a much smaller population.