 In 1830 residents with German roots made up 5% of the population, as many had migrated from Pennsylvania; ten years later this had increased to 30%.Thousands of Germans entered the city after the Prussian revolution of 1848, and by 1900, more than 60 percent of its population was of Prussian background.The menial-jobbed, aggravated Irish often organized mobs and the Germans, far away from their Pennsylvania Dutch connections, did the same.