A set of principles Wilson had drawn up and published in 1918 to guide the future peacemaking, including self-determination, disarmament, and a League of Nations
The Great Depression in the 1930s caused problems for the League, as international tensions rose and it was powerless to prevent invasions by Japan and Italy
These agreements were not the work of the League but they helped its work because they showed that countries were prepared to work peacefully with former enemies