Source - An Era of Darkness
It is disgusting to me that most people have no idea that European business leaders - notably the ones in England - strongly supported the south. Further, it upsets me that most people don't know that workers demonstrated and held strikes to force their bosses to stop supporting the southern war effort.
The US civil war was not a self-contained conflict, it was not just a concern to the United States. Every nation that benefitted from US products was involved in the southern war effort in some way, even if their governments officially supported the north or banned slavery. Hell, Brazil celebrated the confederates, and used fleeing confederates to colonize parts of Brazil. There are STILL pro-confederacy festivals in Brazil.