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Purpose: To maintain international peace and security, develop friendly relations among nations and promote social progress, better living standards and human rights. Year established: 1945.

Purpose: Military alliance for collective defense against aggression. Year established: 1949.

Purpose: To direct and coordinate international health within the United Nations system. Year established: 1948.

Purpose: To provide protection and assistance for victims of armed conflict and strife. Year established: 1863.

Purpose: To regulate international trade. Year established: 1995.

Purpose: To ensure the stability of the international monetary system. Year established: 1944 (began operations in 1945).

Purpose: To provide financial and technical assistance to developing countries for development programs that are meant to reduce poverty. Year established: 1944 (began operations in 1946).

Purpose: To promote Olympism worldwide and lead the Olympic Movement. Year established: 1894.

Purpose: To promote the peaceful use of nuclear energy, and to prevent its use for any military purpose, including nuclear weapons. Year established: 1957.

Purpose: To conduct research and generate action to prevent and end abuses of human rights, and to demand justice for those whose rights have been violated. Year established: 1961.

Purpose: To ensure the ability of the Earth to nurture life in all its diversity by campaigning for the environment. Year established: 1971.

Purpose: To coordinate and unify the petroleum policies of its member countries and ensure the stabilization of oil markets. Year established: 1960.

Purpose: To provide medical aid where it's needed most, often in war-torn regions and countries affected by endemic diseases. Year established: 1971.

Purpose: To enable police around the world to work together to make the world a safer place. Year established: 1923.

Purpose: To discuss and coordinate economic policies among the world's largest advanced economies. Year established: 1975.

Purpose: To conserve nature and reduce the most pressing threats to the diversity of life on Earth. Year established: 1961.

Purpose: To provide humanitarian and developmental aid to children worldwide. Year established: 1946.

Purpose: To settle legal disputes submitted by states and to give advisory opinions on legal questions referred by authorized international organs and agencies. Year established: 1945.

Purpose: To foster economic cooperation and create a single market with free movement of people, goods, services, and capital. Year established: 1993 (Maastricht Treaty).