- Feb 7 The colonial Tasmanian Parliament passes the first piece of legislation (the Electoral Act of 1856) anywhere in the world providing for elections by way of a secret ballot.
- Mar 30 Russia signs the Treaty of Paris, ending the Crimean War
- Jun 9 500 Mormons leave Iowa City, Iowa, and head west for Salt Lake City, Utah, carrying all their possessions in two-wheeled handcarts
- Jun 17 Republican Party opens its 1st national convention in Philadelphia
- Oct 8 The Second Opium War or second Anglo-Chinese War: begins with the Arrow Incident on the Pearl River
1st national meeting of Republican Party (Pittsburgh)
On February 22, 1856