The prominent figure behind the establishment of the United Nations is Eleanor Roosevelt, who played a crucial role in drafting the Universal Declaration of Human Rights. As a delegate to the UN General Assembly and a passionate advocate for civil rights, she influenced the formation of the UN in 1945, following the end of World War II. Her efforts aimed to promote peace, security, and human rights on a global scale and were driven by a commitment to preventing atrocities like the Holocaust from recurring. Roosevelt's legacy in international relations and human rights advocacy continues to resonate in the organization's mission today.