Political Science also studies the conflicts, and relations between various States and nations in the world. Relations between two or more States can be peaceful or full of conflict and hostility.
As there is no supreme authority in the world, conflicts between two or more States or nations sometimes result in war, which is a method of deciding disputes or conflicts between them by a resort to weapons of war and victory on the battlefield.
The victorious then has his way and allocates or captures the disputed territory or country and controls it as it likes. Besides war, disputes between the States can also be settled by more peaceful methods of negotiation and treaty relations, or by forming alliances in order to oppose rival group of nations and States.