The United States is a founding member of the United Nations, when President Roosevelt met with the heads of the United Kingdom, Soviet Union, France and the Republic of China in 1945. The aim of the organization was to bring peace and maintain stability and a Charter was proposed at the United Nations Conference on International Organization in San Francisco. The Charter was ratified by the signatories on the twenty fourth of October, 1945, and the United Nations officially came into being.

The Bretton Woods Conference was an important contribution by the United States and its goal was to create a stable and predictable international monetary regime. The International Monetary Fund (IMF) and the World Bank implemented and promoted the international monetary and trade regime, opening new world markets.

The headquarters of the United Nations are established in New York City and a number of other UN organizations are also situated in the United States including the United Nations Office of the High Representative for the Least Developed Countries (UN-OHRLLS), the United Nations Population Fund (UNFPA), the United Nations Development Programme (UNDP) and UNICEF.

The United States Mission to the United Nations (USUN) is responsible for assisting the country in achieving its foreign policy goals by representing its needs in the United Nations. United States Mission to the United Nations main goals are to contribute to, advance and maintain:

Peace & Security
Climate Change
Human Rights & Democracy
UN Reform
Nonproliferation & Disarmament
Poverty & Development

The United States is a permanent member of the Security Council and the top provider of assessed financial contributions to United Nations peacekeeping operations, contributing 22.000% of the United Nations budget.