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This was a real possibility, given that he was at one point the favored candidate for the Republican nomination for the 1860 elections. So my question is, can you think of how the US Civil War would have gone if he had been elected?
I can already imagine the war being further postponed, because Seward had wanted a withdrawal from Fort Sumter. That would only have delayed the inevitable, though. There was going to be a war one way or another.
Personally, I think the Confederates would have won for this reason. When the Trent Affair broke out, Seward was open to the idea of war, actually believing that war with Britain might bring the seceded states back into the Union. It was a foolish assumption, especially given how the Confederates had already been hoping for European intervention to break the Union blockade, and the Confederates rejoiced when they heard news of the incident, hoping Britain would go to war. Seward would have dragged the United States into an impossible war, and the Confederates would break off.