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Aftermath

At the outbreak of the American Civil War (in 1861), Garibaldi was a very popular figure. The 39th New York Volunteer Infantry Regiment was named Garibaldi Guard after him. Garibaldi expressed interest in aiding the Union, and he was offered a major general's commission in the U.S. Army through a letter from Secretary of State William H. Seward to Henry Shelton Sanford, the U.S. Minister at Brussels, 27 July 1861. On 9 September 1861, Sanford met with Garibaldi and reported the result of the meeting to Seward:

He said that the only way in which he could render service, as he ardently desired to do, to the cause of the United States, was as Commander-in-chief of its forces, that he would only go as such, and with the additional contingent power—to be governed by events—of declaring the abolition of slavery—that he would be of little use without the first, and without the second it would appear like a civil war in which the world at large could have little interest or sympathy.

But Abraham Lincoln was not ready to free the slaves; Sanford's meeting with Garibaldi occurred a year before Lincoln issued the preliminary Emancipation Proclamation. Sanford's mission was hopeless, and Garibaldi did not join the Union army. A historian of the American Civil War, Don H. Doyle, however, wrote, "Garibaldi's full-throated endorsement of the Union cause roused popular support just as news of the Emancipation Proclamation broke in Europe." On 6 August 1863, after Lincoln had issued the final Emancipation Proclamation, Garibaldi wrote to Lincoln, "Posterity will call you the great emancipator, a more enviable title than any crown could be, and greater than any merely mundane treasure."

On 5 October 1860, Garibaldi set up the International Legion bringing together different national divisions of French, Poles, Swiss, Germans and other nationalities, with a view not just of finishing the liberation of Italy, but also of their homelands. With the motto "Free from the Alps to the Adriatic ", the unification movement set its gaze on Rome and Venice. Mazzini was discontented with the perpetuation of monarchial government, and continued to agitate for a republic. Garibaldi, frustrated at inaction by the king, and bristling over perceived snubs, organized a new venture. This time, he intended to take on the Papal States.