As of now, I have been encountering a bunch of useless wars with nations much weaker than me, and even half the world away. I suggest that the algorithm for countries declaring war on each other be changed by...
The AI being much stricter in who it attacks. Right now I have had countries as much as 50x weaker than me try to attack me, which ends up being annoying.
Countries will rarely, if at all, attack overseas nations before Age of Imperialism. Then, when Age of Imperialism happens, Great Powers are more inclined to colonize and attack overseas nations.
Landlocked countrie