In order to understand the entanglement of this shifty gentleman, it is necessary to explain that the discord in interests between the northern and southern states of the American union, due to the economic differences based on slavery, had at last led to open civil war. The federal system established in 1789 had to fight the secessionist efforts of the confederated slave-holding states. We have traced the causes of that great struggle in Chapter XXXVII, §6; its course we cannot relate here, nor tell how President Lincoln (born 1809, died 1865, president from 1861) rose to greatness, how the republic was cleansed from the stain of slavery, and how the federal government of the union was preserved.
For four long years (1861-65) this war swung to and fro, through the rich woods and over the hills of Virginia between Washington and Richmond, until at last the secessionist left was thrust back and broken, and Sherman, the unionist general, swept across Georgia to the sea in the rear of the main confederate (secessionist) armies. All the elements of reaction in Europe rejoiced during the four years of republican dissension; the British aristocracy openly sided with the confederate states, and the British Government permitted several privateers, and particularly the Alabama, to be launched in England to attack the federal shipping. Napoleon III was even more rash in his assumption that after all the new world had fallen before the old. The sure shield of the Monroe Doctrine, it seemed to him, was thrust aside for good, the Great Powers might meddle again in America, and the blessings of an adventurous monarchy be restored there. A pretext for interference was found in certain liberties taken with the property of foreigners by the Mexican president. A joint expedition of French, British, and Spanish occupied Vera Cruz, but Napoleon’s projects were too bold for his allies, and they withdrew when it became clear that he contemplated nothing less than the establishment of a Mexican empire. This he did, after much stiff fighting, making the Archduke Maximilian of Austria, Emperor of Mexico in 1864. The French forces, however, remained in effectual possession of the country, and a crowd of French speculators poured into Mexico to exploit its mines and resources.
But in April, 1865, the civil war in the United States was brought to an end by the surrender of the great southern commander, General Lee, at Appomattox Court House, and the little group of eager Europeans in possession of Mexico found themselves faced by the victorious federal government, in a thoroughly grim mood, with a large, dangerous-looking army in hand. The French imperialists were bluntly given the alternative of war with the United States or clearing out of America. In effect this was an instruction to go. This was the entanglement which prevented Napoleon III from interference between Prussia and Austria in 1866, and this was the reason why Bismarck precipitated his struggle with Austria.
While Prussia was fighting Austria, Napoleon III was trying to escape with dignity from the briars of Mexico. He invented a shabby quarrel upon financial grounds with Maximilian and withdrew the French troops. Then, by all the rules of kingship, Maximilian should have abdicated. But instead he made a fight for his empire; he was defeated by his recalcitrant subjects, caught, and shot as a public nuisance in 1867. So the peace of President Monroe was restored to the new world. There remained only one monarchy in America, the empire of Brazil, where a branch of the Portuguese royal family continued to reign until 1889. In that year the emperor was quietly packed off to Paris, and Brazil came into line with the rest of the continent.
But while Napoleon was busy with his American adventure, Prussia and Italy were snatching victory over the Austrians (1866). Italy was badly beaten at Custozza and in the naval battle of Lissa, but the Austrian army was so crushed by the Prussian at the battle of Sadow, that Austria made an abject surrender. Italy gained the province of Venetia, so making one more step towards unity—only Rome and Trieste and a few small towns on the north and north-western frontiers remained—and Prussia became the head of a North German Confederation, from which Bavaria, Württemberg, Baden, Hesse, and Austria were excluded.
Four years later came the next step towards the natural political map of Europe, when Napoleon III plunged into war against Prussia. A kind of self-destroying foolishness urged him to do this. He came near to this war in 1867 so soon as he was free from Mexico, by demanding Luxembourg for France; he embarked upon it in 1870, when a cousin of the king of Prussia became a candidate for the vacant throne of Spain. Napoleon had some theory in his mind that Austria, Bavaria, Württemberg, and the other states outside the North German Confederation would side with him against Prussia.[481] He probably thought this would happen because he wanted it to happen. But since 1848 the Germans, so far as foreign meddling was concerned, had been in spirit a united people; Bismarck was merely imposing the Hohenzollern monarchy, with pomp, ceremony, and bloodshed, upon accomplished facts. All Germany sided with Prussia.