Determining territorial ownership is a complex and multifaceted process that usually involves the following key factors: 1. **Historical background**: Historical territorial ownership and evolution do have a certain impact on current territorial disputes. Ancient territorial control, historical and cultural connections, etc. can provide certain basis for one party's claims. 2. **International law**: Modern international law plays a vital role in resolving territorial disputes. According to the United Nations Charter and other international treaties, territorial disputes between countries are usually resolved through peaceful negotiations, arbitration or by the International Court of Justice. 3. **Treaties and agreements**: Historical boundary treaties and international agreements are important legal bases for determining current boundaries. Agreements reached by two or more parties through negotiation are usually legally binding. 4. **Current actual control**: The current actual control of a region is also an important factor in determining territorial ownership. Long-term and effective actual control can strengthen a party's sovereignty claim over the region. 5. **Political and diplomatic factors**: Political relations between countries, diplomatic negotiations and the attitude of the international community can also have an impact on the judgment of territorial ownership. Although ancient territorial ownership can be used as a reference to some extent, it is usually not enough to judge modern territorial ownership based solely on historical territorial ownership. Territorial disputes in modern international relations need to be resolved through peaceful and legal means by comprehensively considering multiple factors such as history, law, actual control and international politics.