Which idea resulted in Austria-Hungary being divided into independent states organized around shared culture and language following World War 1?

The idea that led to the division of Austria-Hungary into independent states after World War I was rooted in the principle of self-determination, championed by U.S. President Woodrow Wilson. This principle advocated that ethnic groups should have the right to govern themselves and form their own nations based on shared culture and language. Consequently, the dissolution of the Austro-Hungarian Empire in 1918 resulted in the emergence of several nation-states, such as Czechoslovakia and Yugoslavia, reflecting the diverse ethnic identities within the former empire.