The Sauerkraut Question

The huge influx of German immigrants (some of our grandparents and great  grandparents) into the United States duringthe last half of the 19th and early 20th centuries presented a "German Problem" to the Anglo-American staus quo: Just who were these Germans and their "Kultur" and what threat were they to Anglo-American hegemony in America, and what would it take to "Americanize" them in a manner suitable to Anglo-American sensibilities?!