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Decade of the Gregorian calendar / From Wikipedia, the free encyclopedia

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The 1860s (pronounced "eighteen-sixties") was a decade of the Gregorian calendar that began on January 1, 1860, and ended on December 31, 1869.

From top left, clockwise: Scottish physicist James Clerk Maxwell formulates the classical theory of electromagnetic radiation, bringing together for the first time electricity, magnetism, and light as different manifestations of the same phenomenon; the Meiji Restoration leads to enormous changes in Japan's political and social structure; the International Workingmen's Association is formed in 1864, aimed at uniting a variety of different left-wing socialist, communist and anarchist groups; the Battle of Avay, fought in 1868 during the Paraguayan War, the bloodiest inter-state war in Latin America's history; execution in 1867 of Maximilian I of Mexico, ruler of the Second Mexican Empire, established during the Second French intervention in Mexico; the Battle of Gettysburg, the turning point of the American Civil War, fought in the United States from 1861 to 1865, between the North (the Union) and the South (the Confederacy) as a result of the long-standing controversy over the enslavement of black people; the Suez Canal is inaugurated in 1869; Victor Emmanuel meets Garibaldi near Teano in 1860, at the end of the Expedition of the Thousand.

The decade was noted for featuring numerous major societal shifts in the Americas. In the United States, the election of abolitionist Abraham Lincoln to the presidency in 1860 led to the secession of the southern states in the form of the Confederate States of America (CSA). The resulting American Civil War (1861-1865) would be among the first industrial wars, featuring advanced technology such as steel warships and machine guns. The victory of the Union and subsequent abolition of slavery would contribute to the decline of the global slave trade.

In Latin America, conflict in Mexico ensued after the French Empire installed Maximilian I as Emperor of Mexico; former President Benito Juárez would regain his position in 1867 after a power struggle. The Triple Alliance of Empire of Brazil, Argentina and Uruguay in the Paraguayan War (1864-1870) would be among the bloodiest conflicts in South American history, leading to the death of almost 60% of the Paraguayan population.

The formation of the union of Austria-Hungary in 1867 and the ongoing campaign to unify Italy by Victor Emmanuel II of Sardinia-Piedmont would effect the European balance of power. The United Kingdom would continue engaging in a series of conflicts known as the New Zealand Wars with the indigenous Māori, with the New Zealand land confiscations beginning in 1863.

In Asia, the Meiji Restoration of 1868 would begin the process of transforming Japan into a global imperial power. The Qing Dynasty of China would experience decline following its defeat to the British in 1860 in the Second Opium War. In 1864, the Russian Empire would embark upon the Circassian genocide in the Caucasus, leading to the deaths or expulsion of at least 75% of the Circassian people.