Or you better hope you aren't playing Victoria 2 where your neighbours are Great Powers hungry for land when you decide to help USA recover land that Canada stole from it. This happened while I was playing as Byzantium and being the biggest and most socialistic nation in the world. Suffice to say the other Great Powers jumped in to join as time went and World War 1 thus happened in the 1870ies and lasted six years, resulting in the empires economy completely tanking after it was victorious and pushed a treaty harsher than the Treaty Of Versailles onto the enemies(which was Canada, Paraguay, Scandinavia, Nagpur, China, Japan and several smaller ones). Games like CK2, EU3 and V2 are brilliant for stuff like this.