York grew as an economic center, first as a result of Alexander Hamilton's policies and practices as the first Secretary of the Treasury. In 1842, water was piped from a reservoir to supply the city for the first time. The Great Irish Famine (1845–1850) brought a large influx of Irish immigrants, and by 1850 the Irish comprised one quarter of the city's population. Government institutions, including the New York City Police Department and the public schools, were established in the 1840s and 1850s to respond to growing demands of residents. Modern history Tammany and consolidation: 1855–1897 This period started with the 1855 inauguration of Fernando Wood as the first mayor from Tammany Hall. It was the political machine based among Irish Americans that controlled the local Democratic Party. It usually dominated local politics throughout this period and into the 1930s. Public-minded members of the merchant community pressed for a Central Park, which was opened to a design competition in 1857; it became the first landscape park in an American city. During the American Civil War (1861–1865), the city was affected by its history of strong commercial ties to the South; before the war, half of its exports were related to cotton, including textiles from upstate mills. Together with its growing immigrant population, which was angry about conscription, sympathies among residents were divided for both the Union and Confederacy at the outbreak of war. Tensions related to the war culminated in the Draft Riots of 1863 led by Irish Catholics, who attacked black neighborhood and abolitionist homes. Many blacks left the city and moved to Brooklyn. After the Civil War, the rate of immigration from Europe grew steeply, and New York became the first stop for millions seeking a new and better life in the United States, a role acknowledged by the dedication of the Statue of Liberty in 1886. Early 20th century: 1898–1945 From 1890 to 1930, the largest cities, led by New York, were the focus of international attention. The skyscrapers and tourist attractions were widely publicized. Suburbs were emerging as bedroom communities for commuters to the central city. San Francisco dominated the West, Atlanta dominated the South, Boston dominated New England; Chicago dominated the Midwest United States. New York City dominated the entire nation in terms of communications, trade, finance, popular culture, and high culture. More than a fourth of the 300 largest corporations in 1920 were headquartered