The #1 reason I start wars in Victoria 3 is “look buddy, I have done exhausting diplomatic and political legwork to give your country unfettered trade access to my huge, technologically advanced economy that’s desperate to pay you handsomely for raw materials, but still you refuse to develop your iron/rubber/heroin/whatever deposits to sell the stuff to me. I am sending a team of management consultants (roughly 200,000 of them) to help you with business development.”