Don't forget that the North was de facto a White ethnostate prior to the Civil War. Yankees didn't want slavery out of the West because they were noble humanitarians; they wanted slavery out of the West because they wanted niggers out of the West. Many Union soldiers deserted after the Emancipation Proclamation, saying they didn't sign up to fight for niggers, and there were rebellions in Maryland, New York City and Ohio that had to be put down with the Yankee military. Oh yeah, and don't forget the 1 million or so (~25% of total black population in the US at that time) who either died or became seriously ill as a result of forcible displacement from plantations at the hands of Union soldiers, resulting in: starvation, exposure to the elements, and disease. The young and older were especially hard hit and usually died first. This was even brought up by Southern politicians to Lincoln himself, but Lincoln dismissed the issue with his "root, hog, or die" story, as reported in the New York Times. All of the above documented in the book Sick from Freedom, written by a mainstream Yankee historian.