Answer: self-determination
Step-by-step explanation:
President Woodrow Wilson led the United States during the first world war and after the victory of the allies over the Central powers, came up with 14 points (with the help of leading experts) which he believed could keep the world at peace if followed.
The points showed that self-determination was key to peace meaning that people will be less likely to fight if they were able to govern their own affairs. He therefore called for boundary change to reflect the different peoples of Europe, boundaries which would reflect self-determination.