What is the purpose of the United Nations and what five nations were given the most power in it after the war

United States, United Kingdom, China, France, Russia.

Explanation:

The United Nations (UN) is an international organization that aims to safeguard peace in the world and develop good neighborly relations. The United Nations also aims to promote economic cooperation between countries. The United Nations was formed after the end of World War II because this war had brought unprecedented destruction to humanity. The United Nations was established in 1945 in the United States and is now headquartered in New York.

they wanted the u.s. to fight on the side of the central powers.

answer; taking up arms to defend the nation;