Events from the year 1884 in the United States .
December 6: Washington Monument completed. March 27–29 – Cincinnati riots of 1884 .
April 21 – Hammond, Indiana , is incorporated a city.
May 1 – The eight-hour workday is first proclaimed by the Federation of Organized Trades and Labor Unions in the United States. May 1, called May Day Labour Day
May 17 – Alaska becomes a United States territory .
June 13 – LaMarcus Adna Thompson opens "Gravity Pleasure Switchback Railway ", one of the earliest roller coasters, at Coney Island , New York City.
August 4 – Edward A. O'Neal is reelected the 26th governor of Alabama .
August 5 – The cornerstone for the Statue of Liberty is laid on Bedloe's Island in New York Harbor .
August 10 – An earthquake measuring 5.5 Mercalli intensity of VII (Very strong ). Chimneys were toppled in New York, New Jersey, Connecticut, and Pennsylvania. Property damage was severe in Jamaica and Amityville in New York.[ 1]
August 28 – The earliest known photograph of a tornado is taken by F. N. Robinson during a tornado outbreak in South Dakota .
September 5 – Staten Island Academy is founded.
October – International Meridian Conference in Washington, D.C. , fixes the Greenwich meridian as the world's prime meridian.
October 6 – The United States Naval War College is established in Newport, Rhode Island .
November 4 – 1884 United States presidential election : Democratic governor of New York Grover Cleveland defeats Republican James G. Blaine in a very close contest to win the first of his non-consecutive terms.
December 1 – American Old West : Near Frisco, New Mexico , deputy sheriff Elfego Baca holds off a gang of 80 Texan cowboys who want to kill him for arresting cowboy Charles McCarthy (the cowboys were terrorizing the area's Hispanos and Baca was working against them).
December 6 – The Washington Monument is completed.
December 16 – The World Cotton Centennial World's Fair opens in New Orleans , Louisiana.
Harry S. Truman January 1
January 12
January 26 – Roy Chapman Andrews , adventurer and naturalist (died 1960 )
February 15 – Alfred Carlton Gilbert , inventor, athlete, magician, and businessman (died 1961 )
February 18
March 10 – Stuart Holmes , actor and sculptor (died 1971 )
March 11 – Sheridan Downey , U.S. senator from California from 1939 to 1950 (died 1961 )
March 17 – Alcide Nunez , jazz musician (died 1934 )
March 21 – George D. Birkhoff , mathematician (died 1944 )
March 22 – Arthur H. Vandenberg , U.S. senator from Michigan from 1928 to 1951 (died 1951 )
March 31 – James P. Pope , U.S. senator from Idaho from 1933 to 1939 (died 1966 )
April 1 – George A. Wilson , U.S. senator from Iowa from 1943 to 1949 (died 1953 )
April 17 – Leo Frank , factory superintendent and convicted murderer (died 1915 )
April 20 – Oliver Kirk , bantamweight and featherweight professional boxer (died 1960 )
May 8 – Harry S. Truman , 33rd president of the United States from 1945 to 1953, 34th vice president of the United States from January to April 1945 (died 1972)
May 26 – Charles Winninger , stage and film actor (died 1969 )
June 21
June 22 – James Rector , Olympic athlete (died 1949 )
July 7 – J. Roy Hunt , motion picture cameraman and cinematographer (died 1972 )
August 9 – John S. McCain Sr. , U.S. Navy admiral (died 1945 )
August 27 – Harry Antrim , actor (died 1967 )
September 1 – Richard C. Saufley , naval aviation pioneer (died 1916 )
October 7 – Harold Geiger , aviation pioneer (died 1927 )
October 9 – Martin Johnson , adventurer and filmmaker (died 1937 )
October 11 – Eleanor Roosevelt , First Lady of the United States from 1933 to 1945 (died 1962 )
November 20 – Loyal Blaine Aldrich , astronomer (died 1965 )
December 2 – Ruth Draper , actress and monologist (died 1956 )
Legrand Chapell
14 February
13 March – Leland Stanford Jr. , son of Governor Leland Stanford of California , in whose memory Stanford University is founded (born 1868 )21 March – Ezra Abbot , Bible scholar (born 1819 )23 March – Henry C. Lord , railroad executive (born 1824 )31 March – Frederick Leypoldt , bibliographer (born 1835 in Germany)3 May – Truman Smith , U.S. senator from Connecticut from 1849 to 1854 (born 1791 )6 May – Judah P. Benjamin , United States senator from Louisiana from 1853 till 1861, 1st Confederate States Attorney General , 2nd Confederate States Secretary of War , 3rd Confederate States Secretary of State , died in Paris , France (born 1811 )13 May – Cyrus McCormick , inventor (born 1809 )8 June – Henry Clay Work , composer (born 1832 )12 June – Frank Pidgeon , baseball pitcher (born 1825 )1 July – Allan Pinkerton , detective (born 1819)10 July – Paul Morphy , chess player (born 1837 )15 July – Almira Hart Lincoln Phelps , educator and author (born 1793 )23 August – LeRoy Pope Walker , 1st Confederate States Secretary of War (born 1817 )2 September – Henry B. Anthony , U.S. senator from Rhode Island from 1859 to 1884 (born 1815 )26 September – John W. Garrett , banker, president of the Baltimore and Ohio Railroad and philanthropist (born 1820 )6 November – William Wells Brown , African American writer (born 1814 )9 December – Mary Bell Smith , educator, social reformer, and writer. (born 1818 )Date unknown – Wendel Bollman , civil engineer (born 1814) 
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