Grounds for Territorial Changes in International Law

In the past, territories were often acquired through war and conquest, but modern international law offers other methods for gaining territory without using force. The UN Charter, which serves as evidence of this, includes a principle that prohibits the use of force against the territorial integrity or political independence of any state and

also includes the right of self-defense for nations in the event of an armed attack. This is outlined in Article 2 point 4 and Article 51 of the Charter.