Germans are America’s big ethnic secret. No people and no culture has contributed more to what the United States is and is becoming. In the nation’s ethnic tangle, no root runs deeper than German America. As a scattered community only fitfully conscious of its own existence, none has more successfully pursued wealth, power and intellectual influence. And as a philosophical force in US politics — a whole political mindset — none has greater potency. Germany as a European state may have lost her way, the German language may struggle to keep its world grip, but the German spirit is alive...