The Irish were not to remain long in sympathy with all of the Federal aims. They were fierce rivals with American blacks, competing at the base of the social ladder for such opportunities—work, especially—as were on offer. And once the slaves were formally emancipated by Lincoln in 1863, the natural advantage that the Irish believed they had in the color of their skins quite vanished—and with it much of their sympathy for the Union cause in the war they had chosen to fight. Besides, they had been doing their sums: “We did not cause this war,” one of their leaders said, “but vast numbers of our
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