Events from the year 1855 in the United States.

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← 1854 1853 1852 1855 in the United States → 1856 1857 1858
Decades:	1830s 1840s 1850s 1860s 1870s
See also:	History of the United States (1849–1865) Timeline of United States history (1820–1859) List of years in the United States

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• January – Klamath and Salmon River War: In Klamath County, California, hostility between settlers and the local Native Americans becomes violent. The California State Militia and U.S. Army intervene, ending the war in March.
• January 23 – The first bridge over the Mississippi River opens in what is now Minneapolis, Minnesota (a crossing made today by the Hennepin Avenue Bridge).
• January 26 – The Point No Point Treaty is signed in the Washington Territory.
• February 12 – Michigan State University (the "pioneer" land-grant college) is established.
• February 15 – The North Carolina General Assembly incorporates the Western North Carolina Railroad to build a rail line from Salisbury to the western part of the state.^[1]
• February 22 – Pennsylvania State University is founded as the Farmers' High School of Pennsylvania.
• March 3 – The U.S. Congress appropriates $30,000 to create the U.S. Camel Corps.
• March 16 – Bates College is founded by abolitionists in Lewiston, Maine.
• March 30 – Elections are held for the first Kansas Territory legislature. Missourian 'Border Ruffians' cross the border in large numbers to elect a pro-slavery body.

• April – Cincinnati riots of 1855: Tension between nativists and German-American immigrants in Cincinnati breaks out into territorial street fighting on election day.
• May 17 – The Mount Sinai Hospital is dedicated (as the Jews' Hospital) in New York City; it opens to patients on June 5.
• June 6 – Portland Rum Riot: A crowd gathers at a storehouse believed to hold alcohol in Portland, Maine. The militia is called in and fires on the crowd to disperse the crowd, killing one person.
• June 28 – The Sigma Chi fraternity is founded at Miami University in Oxford, Ohio.
• July 1 – Quinault Treaty signed, Quinault and Quileute cede their land to the United States.
• July 2 – The Kansas Territorial Legislature convenes in Pawnee and begins passing proslavery laws.
• July 4 – Walt Whitman's poetry collection Leaves of Grass is published in Brooklyn.
• July 6 – The Kansas Territorial Legislature meets for the last time in Pawnee, voting to relocate to Shawnee, closer to the border of slave state Missouri.
• July 16 – U.S. Indian commissioner Isaac Stevens signs the Hellgate treaty with Native Americans living in modern-day western Montana.
• August 6 – Bloody Monday: Protestant mobs attack Irish and German Catholics on an election day in Louisville, Kentucky, causing 22 deaths.
• September 3 – First Sioux War: Battle of Ash Hollow – U.S. forces defeat a band of Brulé Lakota in present-day Garden County, Nebraska.
• October 5 – Yakima War: Battle of Toppenish Creek – In the Yakima River Valley, a band of Yakama warriors forces a company of U.S. soldiers to retreat in the first battle of the War.
• October 28–31 – First Fiji expedition: The U.S. Navy dispatches the USS John Adams to Viti Levu, Fiji, to protect American interests. One American sailor is killed and two Marines are wounded.^[2]
• November 1 – 31 people are killed in the Gasconade Bridge train disaster in Missouri.
• November 9–10 – Yakima War: Battle of Union Gap – American soldiers attack a Yakama village, forcing the village to retreat.
• November 21 – Large-scale Bleeding Kansas violence begins with events leading to the Wakarusa War between antislavery and proslavery forces.

• February 4 – George Cope, painter (died 1929)
• February 23 – Jonathan Bourne, Jr., U.S. Senator from Oregon from 1907 to 1913 (died 1940)
• June 14 – Robert M. La Follette, U.S. Senator from Wisconsin (died 1925)
• June 17 – Janet Cook Lewis, portrait painter, librarian, and bookbinder (died 1947)
• July 29 – Bowman Brown Law, politician (died 1916)
• August 4 – Jay Hunt, film director (died 1932)
• September 2 – M. Hoke Smith, U.S. Senator from Georgia from 1911 to 1920 (died 1931)
• October 21 – Howard Hyde Russell, temperance activist (died 1946)
• October 24 – James S. Sherman, 27th vice president of the United States from 1909 to 1912 (died 1912)
• October 26 – Jessie Wilson Manning, American author and lecturer
• November 5 – Eugene V. Debs, union leader (died 1926)^[3]
• November 6 – Annie Keeler, early woman physician (died 1927)
• December 10 – August Spies, labor activist and newspaper editor (died 1887)
• December 28 – John William Wood, Sr., North Carolinan politician, founder of Benson, North Carolina (died 1928)

• March 8 – William Poole, founder of the street gang the Bowery Boys and leader of the Know Nothing political movement (born 1821)
• March 25 – Thomas Fitzgerald, United States Senator from Michigan from 1848 till 1849. (born 1796)
• March 28 – William S. Archer, United States Senator from Virginia from 1841 till 1847. (born 1789)
• May 7 – Walter T. Colquitt, United States Senator from Georgia from 1843 till 1848. (born 1799)
• June 29 – John Gorrie, physician, scientist, inventor, and humanitarian (born 1803)
• August 18 – Thomas Metcalfe, United States Senator from Kentucky from 1848 till 1849. (born 1780)

• Timeline of United States history (1820–1859)