A report on Allies of World War II, Soviet Union and United Nations

The United Nations Security Council (UNSC) is one of the six principal organs of the United Nations (UN) and is charged with ensuring international peace and security, recommending the admission of new UN members to the General Assembly, and approving any changes to the UN Charter.

These were the great powers that were the victors of World War II (or their successor states).

However, the League lacked representation for colonial peoples (then half the world's population) and significant participation from several major powers, including the US, the USSR, Germany and Japan; it failed to act against the 1931 Japanese invasion of Manchuria, the Second Italo-Ethiopian War in 1935, the 1937 Japanese occupation of China, and Nazi expansions under Adolf Hitler that escalated into World War II.

The Spanish–American War and World War I established the U.S. as a world power, and the aftermath of World War II left the United States and the Soviet Union as the world's two superpowers.

It is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, NATO, and other international organizations.

At first neutral during World War II, the United States in March 1941 began supplying materiel to the Allies.

It involved the vast majority of the world's countries—including all of the great powers—forming two opposing military alliances: the Allies and the Axis powers.

Under the Molotov–Ribbentrop Pact of August 1939, Germany and the Soviet Union had partitioned Poland and marked out their "spheres of influence" across Finland, Estonia, Latvia, Lithuania and Romania.

The United Nations (UN) was established to foster international co-operation and prevent future conflicts, with the victorious great powers—China, France, the Soviet Union, the United Kingdom, and the United States—becoming the permanent members of its Security Council.

The Yalta Conference (codenamed Argonaut), also known as the Crimea Conference, held 4–11 February 1945, was the World War II meeting of the heads of government of the United States, the United Kingdom, and the Soviet Union to discuss the postwar reorganization of Germany and Europe.

Yalta was the second of three major wartime conferences among the Big Three.

Roosevelt wanted Soviet support in the Pacific War against Japan, specifically for the planned invasion of Japan (Operation August Storm), as well as Soviet participation in the United Nations.

The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc, which began following World War II.

The conflict was based around the ideological and geopolitical struggle for global influence by these two superpowers, following their temporary alliance and victory against Nazi Germany in 1945.

The 1945 Allied conference in San Francisco established the multi-national United Nations (UN) for the maintenance of world peace, but the enforcement capacity of its Security Council was effectively paralyzed by the ability of individual members to exercise veto power.

Their members were called the Four Powers during World War II and were the four major Allies of World War II: the United Kingdom, the United States, the Soviet Union, and China.

When the United Nations was officially established later in 1945, France was in due course added as the fifth permanent member of the Security Council because of the insistence of Churchill.

The United Kingdom is a member of the Commonwealth of Nations, the Council of Europe, the G7, the Group of Ten, the G20, the United Nations, NATO, AUKUS, the Organisation for Economic Co-operation and Development (OECD), Interpol, and the World Trade Organization (WTO).

The Grand Alliance of Britain, the United States and the Soviet Union formed in 1941 leading the Allies against the Axis powers.