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The union and the south was confederate states
Yes.
He needed their support to win the war against the south.
because they want the people enslaved in the south to be free...
Abraham Lincoln, because he was on south side
For the south, It was a great thing. They actually praised the assinator that committed the crime. For the Northernaers, it made them feel rather sorry for him. He was only trying to do some good.
There are some disagreements about why President Lincoln and the Northerners were willing to fight a war to save the country instead of letting the South secede peacefully. It may have been because the United States was largely seen as a political experiment and they didn't want to see it fail.
No. The issue at the beginning was not slavery itself. It was the proposed extension of slavery and the cotton trade, and the prospect of the South growing rich enough to form a separate nation, taking the cotton revenues with them. It was only after Lincoln issued the Emancipation Proclamation that the institution of slavery became the target. But even that did not turn most Northerners into Abolitionists. They just wanted to win the war.
The Union won the Civil War and took over the South. There were Northerners that came down to take political positions. Abraham Lincoln and his vice president, Andrew Johnson, wanted to be gentle with the South but after Lincoln was killed, the Republicans in Congress wanted to punish the South. They controlled the Reconstruction.
northerners who came to the south after the civil war
The correct answer to this is Frederick Douglass. Along with Horace Greeley, Frederick Douglass urged or more like provoked Lincoln to turn the war into a battle to end slavery in America. Northerners also supported this position. I hope this helps
Lincoln would use military force only when necessary.