What would be financial markets impact if USA had a Civil War

L'auteur se demande quel serait l'impact d'une guerre civile aux États-Unis sur les marchés financiers, en particulier sur les institutions financières européennes et les systèmes de paiement.

What would happen to financial markets if USA goes into Civil War? I'm less interested in prices of stocks or ETFs itself, but more in impact on financial institutions, **especially Europeans.** How would this impact European Stock Exchanges? How about brokers? (XTB, Degiro) Euro as a currency?... What controversial thoughts on not obvious consecuences do you have? How about payment systems (Visa, Mastercard)? Dollar accounts in European banks? I'm really interested in what might happen in such a scenario! I'm also going to read a bit about US previous Civil War and stock market during WW2, but would assume things changed A LOT since then :D Disclaimers: a) probability of described is extremely low (but maybe the highest in \~150 years / 75 years) b) this is highly theoretical c) I'm not advocating or calling for anything, I'm trying to figure out / hear thoughts from people with more financial markets / economics knowledge d) if you have an opinion on how crazy or warmongery or whatever I am, feel free to keep it out of this post, please Note: Mods, if you think this is too much, feel free to remove it.