Why did winning just the northern states
guarantee that Lincoln would secure the majority
of electoral votes?

Explanation:

The 1864 election was the first time since 1812 that a presidential election took place during a war. For much of 1864, Lincoln himself believed he had little chance of being re-elected. ... Because of this, McClellan was thought to be a heavy favorite to win the election.

abraham lincoln, according to anyone who was connected with agriculture, represented the worst of northern politicians. shortly after lincoln was elected, south carolina seceded from the union. they along with other southern states, retained their anger. in a way, it was their own fault: the democrats were split in the south. some wanted slavery to be extended in other states that were about to join the union and some didn't want it badly enough. lincoln had a solid backing from his party: the republicans were united in not wanting slavery to be expanded.

lots of people lost money in both