Also, about the 3/5ths' compromise, how hard would it be to calculate that? All slaves being 3/5ths of a person. How unnecessary.
There might be some joke here, but I don't get it, so I'll treat this as a serious question:
Its 60%. Not that hard to calculate.
The compromise was set up because the southern states were getting marginalized in the House, where representation is based on population. Without the compromise, the southern states would have never joined the union because they would have been having policy dictated to them by the north. This didn't get better as time went on.
I posted this before, but the Civil war was about states rights, or more specifically the question of could states have policy its residents disagreed with forced on it by other states (More specifically, the Federal Government). It just so happens the state right that was being debated was, chiefly, slavery.
This is not apples-to-apples here but:
Imagine President Trump decides to make marijuana double extra illegal, he declares state laws legalizing it/decriminalizing it in any way invalid (Ginsberg & Sotomayor had gotten blitzed one weekend, reenacted the end of Thelma and Louise, so Trump has appointed a majority to the supreme court; the SCOTUS has confirmed the law). Any state government official found not to be enforcing federal drug law to the utmost will be guilty of federal crimes, open to arrest & replacement by a federal appointee until next election.
In response to this, California, Oregon, Washington, Nevada, New York, and Colorado all vote to secede from the Union; when DEA task forces arrive to enforce the law they are fired on by the respective states' national guards, and Civil War II starts.
"The Second American Civil War was fought over the legalization of Marijuana" would not be a wrong statement, but it would be very far accurate. There were more things going on in the country, and the areas affected, the very Trump Derangement Syndrome this thread is for discussing, and the states' strained relationship with the federal government.
It wouldn't be just over 'Can weed be legal?' even if that was topic that brought the situation to a head.