Answer:
Before the World War 2 happened, there was a body called League of Nations with the mandate to promote peace and security in the war. As a result of the fallout of the war, another body called United Nations was formed due to the failure of League of Nations to prevent the world war 2.
The opinion of the United States government have about joining the United Nations was to maintain peace. This was found in President Franklin D. Roosevelt believe that U.S. leadership was essential for the creation of another international organization aimed at preserving peace, and his administration engaged in international diplomacy in pursuit of that goal. He also worked to build domestic support for the concept of the United Nations.
After Roosevelt’s death, President Harry S Truman also assumed the important task of maintaining support for the United Nations and worked through complicated international problems, particularly with the Soviet Union, to make the founding of the new organization possible.
After nearly four years of planning, the international community finally established the United Nations in the spring of 1945.
Step-by-step explanation: