So. 1947. As you MAY know, America was just a couple of years past a big war, a war in which one of the main adversaries was Germany. This was the second war with Germany. The first had occurred from 1914-18, with the US only really getting involved in the last year. It was an intense war, though, and Germans in America/German-Americans being stigmatized stateside. This didn't really happen in the second war, though, due to a number of factors: German-Americans had assimilated more, our military leaders had names like "Eisenhower" and "Nimitz", the Japanese attacking Pearl Harbor and their descendants not being white made them more of a target, etc.
All of this might sound like a digression, but Germany, the German people, and the war(s) lie at the heart of this episode.