Originally, the Council was designed to have five permanent members: Great Britain, France, Italy, Japan, and the United States. However, because the United States Senate failed to ratify the Treaty of Versailles, the US never joined. Consequently, the Council launched with only four permanent members.

The Soviet Union is the only member nation that was formally expelled from the League of Nations. The Council of the League voted to expel the USSR on December 14, 1939, in response to the Soviet invasion of Finland (the Winter War), which was deemed an act of aggression violating the Covenant.

This question appears to have a mismatch between the text and the options in the original source, as the text asks for a country while the options are years. However, regarding the year 1921, it was a significant year for the League's early admissions and dispute resolutions, such as the Aaland Islands dispute. The actual expulsion of a member (the Soviet Union) occurred much later in 1939.

The original members of the League of Nations included the signatories of the Treaty of Versailles. The Covenant stipulated that states invited to accede to the Covenant could become original members if they did so by March 20, 1920. By this date, the total number of original founding members was finalized at 32.

The Covenant of the League of Nations consisted of 26 Articles. These articles outlined the structure of the League, the rules for preventing war, the administration of mandated territories, and the promotion of international cooperation. It was included as Part I of the Treaty of Versailles.

The League of Nations officially came into existence on January 10, 1920, when the Covenant of the League of Nations took effect. This occurred exactly when the Treaty of Versailles was ratified by the major powers, marking the beginning of the first international organization whose principal mission was to maintain world peace.

President Woodrow Wilson outlined his Fourteen Points in a speech given to the United States Congress on January 8, 1918. These points were intended to serve as a blueprint for world peace and were used for peace negotiations after World War I. They included the proposal for the establishment of a general association of nations, which later became the League of Nations.

Pakistan joined the Baghdad Pact (later renamed CENTO) in 1955 to bolster its defense capabilities. While the provided option suggests May, historical records indicate Pakistan formally acceded on September 23, 1955, joining the original signatories Iraq and Turkey.

The Balkan Pact of 1934 was signed by four countries: Greece, Turkey, Romania, and Yugoslavia. These nations agreed to suspend all disputed territorial claims against each other and their immediate neighbors.

The Balkan Pact (or Balkan Entente) was signed on February 9, 1934, in Athens. It was a treaty between Greece, Turkey, Romania, and Yugoslavia designed to guarantee the signatories' existing borders and maintain the geopolitical status quo in the region against Bulgarian and Italian expansionism.