(A) ** League of Nations
(B) United Nations
(C) Roosevelt Corollary
(D) Monroe Doctrine
EXPLANATIONS BELOW
Concept note-1: -After World War I, US President Woodrow Wilson helped to build an international peacekeeping organization.
Concept note-2: -Wilson also made proposals that would ensure world peace in the future. For example, he proposed the removal of economic barriers between nations, the promise of “self-determination” for oppressed minorities, and a world organization that would provide a system of collective security for all nations.
Concept note-3: -The Fourteen Points in the speech were based on the research of the Inquiry, a team of about 150 advisers led by foreign-policy adviser Edward M. House, into the topics likely to arise in the anticipated peace conference.