Please name another western country that had to kill off 600k young men to “abolish” slavery.
The war between the states was a war  of control over the economy of the US. Southern planters versus northern bankers and industrialist

Slavery had almost nothing to do with it 

 it was becoming socially unpopular as well, and there was a move towards proper employment arrangements like modern sharecroppers 

 Actually, there is no other country where the term "abolishing slavery" emerged other than in America. 

 All of the other countries abolished slavery sans a civil war, Brazil is an example