In 1855, when Chicago's recently elected mayor Levi Boone pushed through a law forbidding the sale of alcohol on Sunday, the city pushed back. To the German community, the move seemed a deliberate provocation from Boone's stridently anti-immigrant Know-Nothing Party. Beer formed the centerpiece of German Sunday gatherings, and robbing them of it on their only day off was a slap in the face. On April 21, 1855, an armed mob poured across the Clark Street...