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Giuseppe Maria Garibaldi (/ ˌ ɡ ær ɪ ˈ b ɑː l d i / GARR -ib- AHL -dee, Italian:; 4 July 1807 – 2 June 1882) was an Italian general, patriot, revolutionary and republican. He contributed to Italian unification (Risorgimento) and the creation of the Kingdom of Italy. He is considered to be one of Italy's " fathers of the fatherland ", along with Camillo Benso, Count of Cavour, Victor Emmanuel II of Italy and Giuseppe Mazzini. Garibaldi is also known as the "Hero of the Two Worlds" because of his military enterprises in South America and Europe.

Garibaldi was a follower of the Italian nationalist Mazzini and embraced the republican nationalism of the Young Italy movement. He became a supporter of Italian unification under a democratic republican government. However, breaking with Mazzini, he pragmatically allied himself with the monarchist Cavour and Kingdom of Sardinia in the struggle for independence, subordinating his republican ideals to his nationalist ones until Italy was unified. After participating in an uprising in Piedmont, he was sentenced to death, but escaped and sailed to South America, where he spent 14 years in exile, during which he took part in several wars and learned the art of guerrilla warfare. In 1835 he joined the rebels known as the Ragamuffins (farrapos), in the Ragamuffin War in Brazil, and took up their cause of establishing the Riograndense Republic and later the Catarinense Republic. Garibaldi also became involved in the Uruguayan Civil War, raising an Italian force known as Redshirts, and is still celebrated as an important contributor to Uruguay's reconstitution.

In 1848, Garibaldi returned to Italy and commanded and fought in military campaigns that eventually led to Italian unification. The provisional government of Milan made him a general and the Minister of War promoted him to General of the Roman Republic in 1849. When the war of independence broke out in April 1859, he led his Hunters of the Alps in the capture of major cities in Lombardy, including Varese and Como, and reached the frontier of South Tyrol; the war ended with the acquisition of Lombardy. The following year, 1860, he led the Expedition of the Thousand on behalf of, and with the consent of, Victor Emmanuel II, King of Sardinia. The expedition was a success and concluded with the annexation of Sicily, Southern Italy, Marche and Umbria to the Kingdom of Sardinia before the creation of a unified Kingdom of Italy on 17 March 1861. His last military campaign took place during the Franco-Prussian War as commander of the Army of the Vosges.

Garibaldi became an international figurehead for national independence and republican ideals, and is considered by twentieth-century historiography and popular culture as Italy's greatest national hero. He was showered with admiration and praise by many contemporary intellectuals and political figures, including Abraham Lincoln, William Brown, Francesco de Sanctis, Victor Hugo, Alexandre Dumas, Malwida von Meysenbug, George Sand, Charles Dickens, and Friedrich Engels.

Garibaldi also inspired later figures like Jawaharlal Nehru and Che Guevara. Historian A. J. P. Taylor called him "the only wholly admirable figure in modern history". In the popular telling of his story, he is associated with the red shirts that his volunteers, the Garibaldini, wore in lieu of a uniform.