of Trade. By 1857, Chicago was the largest city in what was then called the Northwest. In 20 years, Chicago grew from 4,000 people to over 90,000. Chicago surpassed St. Louis and Cincinnati as the major city in the West and gained political notice as the home of Stephen Douglas, the 1860 presidential nominee of the Northern Democrats. The 1860 Republican National Convention in Chicago nominated the home-state candidate Abraham Lincoln. The city's government and voluntary societies gave generous support to soldiers during the American Civil War. Many of the newcomers were Irish Catholic and German immigrants. Their neighborhood saloons, a center of male social life, were attacked in the mid-1850s by the local Know-Nothing Party, which drew its strength from evangelical Protestants. The new party was anti-immigration and anti-liquor and called for the purification of politics by reducing the power of the saloonkeepers. In 1855, the Know-Nothings elected Levi Boone mayor, who banned Sunday sales of liquor and beer. His aggressive law enforcement sparked the Lager Beer Riot of April 1855, which erupted outside a courthouse in which eight Germans were being tried for liquor ordinance violations. After 1865, saloons became community centers only for local ethnic men, as reformers saw them as places that incited riotous behavior and moral decay. Salons were also sources of musical entertainment. Francis O'Neill, an Irish immigrant who later became police chief, published compendiums of Irish music that were largely collected from other newcomers playing in saloons. By 1870, Chicago had grown to become the nation's second-largest city and one of the largest cities in the world. Between 1870 and 1900, Chicago grew from a city of 299,000 to nearly 1.7 million and was the fastest-growing city in world history. Chicago's flourishing economy attracted huge numbers of new immigrants from Eastern and Central Europe, especially Jews, Poles, and Italians, along with many smaller groups. Many businesspeople and professionals arrived from the eastern states. Relatively few new arrivals came from Chicago's rural hinterland. The exponential growth put increasing pollution on the environment, as hazards to public health impacted everyone. Gilded Age Most of the city burned in the 1871 Great Chicago Fire. The damage from the fire was immense since 300 people died, 18,000 buildings were destroyed, and nearly 100,000 of the city's 300,000 residents were left homeless. Several key factors exacerbated the spread of the fire. Most of Chicago's buildings and sidewalks were