During the cold war, both leaders refrained from any physical or official acts of warfare. It mostly consisted of them taking control of foreign nations that were battling each other, but neither the US or Soviet Union declared war on one another. This was because it happened so soon after WWII that neither wanted to be held responsibly for another war.
The south states did not like Abraham Lincoln. Abraham acted against slavery and the southern states were mainly based on slavery. This is when the southern states started to break from the United States. This is how the southern states reacted to the election of Abraham Lincoln.
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Cause they ran away when they saw him