I would add for historical friendship: 100 trust, 200 opinion, and at least 100 opinion from your country of them.

This is a WONDERFUL mod idea.

i feel like high trust should also be maintained for some time for nations to become historical friends

Awesome idea!

@Lord Bowser Hi, thanks for insightful comment ^^ after analyzing Anglo-French relations I came to conclusion that after some years of being enemies or after a number of wars against each other historical rivalries started to be a thing. Maybe I will also count a number of pillaged (scorch earthed) provinces to be considered. Great idea about making it a mtth event insted of flat X years ^^

Maybe if a war is at least 5 years long and mostly equal (+/-20% warscore?) there is a random event that makes the two war leaders historical rivals? with some high mtth, which is reduced if the war is even longer? That way, two nations of similar size should be more likely to become rivals, as they are already fighting and no one is winning decisively
Long rivals becoming historical rivals also sounds good, though it shouldn't be flat 50 years. Maybe just make a high mtth for any two mutual rivals to become historical rivals, and then reduce the mtth if they are fighting a war, having a truce, etc?

@Clark Crente ^^

@God Gamer I was thinking about dynamic historical rivals but I still have to figure out sth not too punishing, thought about sth like being rivals for X years (like ie. 50) to become historical. What do you think? Bc if you can humiliate twice a tag then its fate is already sealed.

@Feraa Hi, interesting idea, I will add this option soon

HE IS UNSTOPPABLE, BEST MODDER IN EU4 BUSINESS BY FARRRR


PDX YOUR FOOLS, HIRE HIM!!!!111

humiliate rival cb two times to add historical rival?

Make a way to remove historical rivalries for 100 favors, too?