Hundreds of thousands of flags in black, red and gold are flying over town squares across Germany, where crowds of Germans are enthusiastically cheering, "Deutschland! Deutschland!" In the past, such a sight would be greeted by the rest of the world with anxiousness, even fear. To the neighboring countries of France, the Netherlands and Poland, especially, images of patriotic Germans bring back dark memories of the Third Reich's dominance over Europe prior to and during World War II. Even in modern Germany itself, a show of national pride was met with raised eyebrows and discomfort. Those who paraded the national...