In the spring of 1945, representatives of fifty nations gathered in San Francisco to put the final touches to a document of far-reaching consequences--the Charter of the United Nations. Enthusiastically supported by the United States, the U.N. Charter went into effect on October 24, 1945. Two years later the U.N. General Assembly adopted a U.S.-sponsored resolution declaring October 24th United Nations Day, to be commemorated annually by all member-states of the United Nations. Since 1947, U.N. Day has been observed in nations large and small around the world.
The United Nations is today, more than ever, engaged in service to all the world's nations and peoples, but its ability to function is hampered by financial problems. Unless Member States pay their debts to the Organization – over $2.6 billion is owed as of 31 May 1999 -- the UN will remain in a precarious financial situation. It is clear that this situation stems in part from widespread public misunderstandings about what the UN really is -- and does.
Some information obtained from:
Official UN Web Site
Here is the list of the 189 Member States of the United Nations 
with dates on which they joined the Organization.
List of Member States
History of the UN
The name "United Nations", coined by United States President Franklin D. Roosevelt, was first used in the "Declaration by United Nations" of 1 January 1942, during the Second World War, when representatives of 26 nations pledged their Governments to continue fighting together against the Axis Powers.
More History of the UN
United Nations Volunteers
The United Nations Volunteers program (UNV) is the UN program that supports human development globally by promoting volunteerism and by mobilizing volunteers. It is administered by UNDP and operates amidst growing recognition that volunteerism makes important contributions, economically and socially, to more cohesive societies by building trust and reciprocity among citizens. Every year some 5,000 UN Volunteers from more than 150 different nationalities actively support the program of the United Nations itself and almost all UN funds, program and specialized agencies.
 

UNV is administered by the United Nations Development Programme (UNDP), based at UN Headquarters in New York.

UNDP has specialized expertise in the following areas:

                   •Democratic Governance
                   •Poverty Reduction
                   •Energy and Environment
                   •Peace-Building and Disaster Mitigation
                   •HIV/AIDS
                   •Information and Communications Technology

Meet the people the UN Helps
Some UN Programs
Peacekeeping
Economic and Social Development
Prevention of Crime
Narcotic Drugs
Social Developement
Programs for Women
Trade
Human Rights
Environment
Many more Programs
World Conference Against Racism
Universal Declaration of Human Rights
Humanitarian Affairs
International Law
United Nations Educational, Scientific and 
UN Cultural Organization (UNESCO)
Development Fund for Women
UN Centre for Human Settlements (Habitat)
UN Office for Drug Control and Crime Prevention
UN Headquarters in New York

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