What school of thought dominated Western international relations theory during the two world wars

What school of (idealism),

dominated Western international relations theory during the two world wars.

The Idealist school believed that, in addition to war, states could achieve their security through peaceful means. With World War I as the demarcation point, the idealist tradition of international relations began to shift to what is now known as neoliberal institutionalism. Idealism and neoliberal institutionalism focus more on collective security and interdependence than realism. The representative of the idealist school, U.S. President Woodrow Wilson, believed that the establishment of international organizations, sound international law and international conventions could ensure peace and security.