What principle was President Wilson asserting by calling for the creation of countries Romania Serbia Montenegro and Poland?

The principle that President Wilson was asserting by calling for the creation of countries such as Romania, Serbia, Montenegro, and Poland was the principle of self-determination. This principle states that people should have the right to determine their own political status and to form their own independent states. Wilson believed that this principle was essential for ensuring the peace and security of the world, as it would prevent conflicts between different groups of people who were trying to control the same territory.