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March 4: John Quincy Adams becomes the sixth U.S. President
John C. Calhoun becomes the seventh U.S. Vice President
January–March[]
January 10 – Indianapolis becomes the capital of Indiana (moved from Corydon, Indiana).
February 9 – After no presidential candidate receives a majority of U.S. Electoral College votes, the United States House of Representatives elects John Quincy AdamsPresident of the United States in a contingent election.
February 12 – Treaty of Indian Springs: The , led by William McIntosh, cedes a large amount of Creek territory in Georgia to the United States government.
March 4 – John Quincy Adams is sworn in as the sixth President of the United States, and John C. Calhoun is sworn in as Vice President of the United States.
April 30 – Upper Creek chief Menawa leads an attack that assassinates William McIntosh for signing the Treaty of Indian Springs.
May 11 – American Tract Society is founded.
June 3 – Kansa Nation cedes its territory to the United States (see History of Kansas).
June 11 – The first cornerstone is laid for Fort Hamilton in New York City.
July–September[]
July 14 – The Jefferson Literary and Debating Society is founded by 16 disgruntled members of the now-defunct in Room 7, West Lawn, of the University of Virginia.
October 26 – The Erie Canal opens, granting passage from Albany, New York to Lake Erie.
November 7 – Treaty of St. Louis: 1,400 Missouri Shawnees are forcibly relocated from Missouri to Kansas. (See History of Kansas)
November 12 – New Echota designated capital of the Cherokee Nation.
November 26 – At Union College in Schenectady, New York a group of college students form Kappa Alpha Society as the first college social fraternity (it is the first to combine aspects of secret Greek-letter societies, literary societies and formalized student social groups).
Undated[]
The Osage Nation cedes traditional lands by treaty.
The Cherokee Nation officially adopts Sequoyah's syllabary.
Vancouver, Washington is established by Dr. John McLoughlin on behalf of the Hudson's Bay Company.
Ypsilanti, Michigan is established.
Vicksburg, Mississippi is incorporated.
New Harmony, Indiana established as a social experiment, built by the Harmony Society and sold to Robert Owen.