Decades: 1770s 1780s 1790s 1800s 1810s - 1820s - 1830s 1840s 1850s 1860s 1870s
Years: 1820 1821 1822 1823 1824 - 1825 - 1826 1827 1828 1829 1830
February 9 - After no presidential candidate received a majority of electoral votes, the United States House of Representatives elects John Quincy Adams President of the United States.
February 12 - The Creek cede the last of their lands in Georgia to the United States government, and migrate west
March 4 - John Quincy Adams officially succeeds James Monroe as President of the United States.
July 6 - The Duke of Schleswig-Holstein-Sønderborg-Beck gains possession of Glücksburg and changed his title to Friedrich Wilhelm, Duke of Schleswig-Holstein-Sonderburg-Glücksburg. The line of Schleswig-Holstein-Sonderburg-Glücksburg later became the Royal House of Greece, Denmark and Norway.
July 30 - Malden Island discovered.
August 6 - Bolivia gains independence from Peru.
September 27th The world's first modern railway, the Stockton and Darlington Railway opens in England.
October 26 - The Erie Canal opens - passage from Albany, New York to Lake Erie
November 26 - At Union College in Schenectady, New York a group of college students form Kappa Alpha as the first college social fraternity (it was the first to combine aspects of secret Greek-letter societies, literary societies and formalized student social groups).
Decembrist Revolt in Russia.
Year in topic
1825 in literature
1825 in science
January 25 - George Pickett, Confederate general (+ 1876)
March 22 - Jane Sym, future First Lady of Canada (+ 1893)
May 4 -Sir Thomas Henry Huxley, English biologist († 1895)
September 11 - Eduard Hanslick, music critic († 1904)
October 25 - Johann Strauss II, composer († 1899)
November 9 - A.P. Hill, Confederate general (+ 1865)
Henri Boulard, literary figure
May 7 - Antonio Salieri, composer
May 19 - Comte, founder of French socialism
Heads of states
Ottoman Empire - Mahmud II Sultan of the Ottoman Empire (1808-1839)
Prussia - Frederick William III King of Prussia (1797-1840)
Russia - Alexander I Tsar of Russia (1801-1825)\n