1870: Mar. 30: The 15th Amendment to the US Constitution guarantees the right to vote regardless "of race, color, or previous condition of servitude." 1871: P.T. Barnum opens his three-ring circus, hailing it as the "Greatest Show on Earth." Mar. 3: Congress declares that Indian tribes will no longer be treated as independent nations with whom the government must conduct negotiations. Oct. 8: The Great Chicago Fire claims 250 lives and destroys 17,500 buildings. 1874 The introduction of barbed wire provides the first economical way to fence in cattle on the Great Plains. The discovery of gold leads thousands of prospectors to trespass on Indian lands the Black Hills in Dakota territory. 1875 Mar. 1: Congress passes the Civil Rights Act of 1875 to guarantee equal use of public accommodations and places of public amusement. It also forbids the exclusion of African Americans from jury duty. 1876 Feb. 14: 29-year-old Alexander Graham Bell patents the telephone. June 25: George A. Custer and 265 officers and enlisted men are killed by Sioux Indians led by Sitting Bull and Crazy Horse at the Little Horn River in Montana. 1877 Feb. 27: An electoral commission declares Rutherford Hayes the winner of the disputed presidential election. Apr. 10: President Hayes begins to withdraw federal troops from the South, marking the official end to Reconstruction. July 16: The Great Railroad Strikes begins in Marinsburg, W. Va., after the Baltimore and Ohio Railroad imposes a 10 percent wage cut. Dec. 6: 30-year-old Thomas Edison invents the phonograph. 1878 German engineer Karl Benz produces the first automobile powered by an internal combustion engine. Jan. 10: The Senate defeats a woman's suffrage amendment 3416. 1879 Feb. 15: Congress grants woman attorneys the right to argue cases before the Supreme Court. Oct. 21: Thomas Edison invents the light bulb. 1880 US population: 50,155,783 1882 May 6: Congress passes the Chinese Exclusion Act, barring Chinese Chinese immigration for ten years. 1883 Oct. 15: The Supreme Court rules that the Civil Rights Act of 1875 only forbids state-imposed discrimination, not that by individuals or corporations. 1884 May 1: Construction begins in Chicago on the first building with a steel skeleton, William Jenney's ten-story Home Insurance Company, marking the birth of the skyscraper. Oct. 9: Rev. Samuel D. Burchard of New York calls the Democrats the party of "Rum, Romanism, and Rebellion." With help of Irish-American voters, Democratic presidential nominee Grover Cleveland carried New York by 1,149 votes and won the election. 1886 May 10: The Supreme Court holds that corporations are persons covered by the 14th Amendment, and are entitled to due process. Oct. 28: President Grover Cleveland unveils the Statue of Liberty. 1887 Feb. 4: The Interstate Commerce Act requires railroads to charge reasonable rates and forbids them from from offering rate reductions to preferred customers. Feb. 8: The Dawes Severalty Act subdivides Indian reservations into individual plots of land of 160 to 320 acres. "Surplus" lands are sold to white settlers. 1890 US population: 62,947,714. July 2: Congress passes the Sherman Anti-Trust Act. Nov. 1: Mississippi Plan. Mississippi restricts black suffrage by requiring voters to demonstrate an ability to read and interpret the US Constitution. Dec. 15: Indian police kill Sitting Bull in South Dakota. Dec. 29: Wounded Knee Massacre. 1891 James Naismith, a physical education instructor at the YMCA Training College in Springfield, Mass., invents basketball. May 19: The Populist party is founded in Cincinnati, Ohio. Sept. 22: 900,000 acres of land ceded to the Sauk, Fox, and Pottawatomi Indians is opened to white settlement. 1892 Jan. 1: Ellis Island opens to screen immigrants. Twenty million immigrants passed through it before it was closed in 1954. 1893 Frederick Jackson Turner delivers his address on "The Significance of the Frontier in American History," exploring the the frontier experience's role in shaping American character. 1894 May 10: Pullman Strike. Workers at the Pullman sleeping car plant in Chicago go on strike after the company cut wages without reducing rents in company-owned housing. On June 26, the American Railway Union begins to boycott trains carrying Pullman cars. July 3: Federal troops enforce a court injunction forbidding the American Railway Union from interfering with interstate commerce and delivery of the mail. 1896 May 18: Plessy v. Ferguson. The US Supreme Court rules that segregation of blacks and whites was permitted under the Constitution so long as both races receive equal facilities. 1898 Feb. 9: The de Lome letter, written by the Spanish minister to the United States, characterizes Pres. McKinley as a weakling lacking integrity. It is printed in William Randolph Hearst's New York Journal. Feb. 15: The battleship Maine blows up and sinks while anchored in Cuba's Havana harbor. Apr. 25 to Aug. 12: Spanish-American War. As a result of the conflict, the United States acquires Puerto Rico, Guam, and the Philippines. May 1: Commodore George Dewey's flotilla defeats the Spanish fleet at Manila Bay in the Philippines, suffering only eight wounded. May 28: The Supreme Court rules that a child born of Chinese parents in the United States is an American citizen and cannot be deported under the Chinese Exclusion Act. July 7: President McKinley signs a resolution annexing Hawaii.