What was the purpose of the united nations

The UN Charter sets out four main purposes: Maintaining worldwide peace and security. Developing relations among nations. Fostering cooperation between nations in order to solve economic, social, cultural, or humanitarian international problems.

Answer:  These are the three main purposes of the United Nations:

To maintain international peace and security To develop friendly relations between nations based on respect for human rightsTo solve economic, social, and humanitarian problems

Detail:

The UN Charter, signed in 1945, lists the purposes of the organization in Chapter I, Article 1.  Here's the official wording as found in the Charter:

The Purposes of the United Nations are:

To maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace; To develop friendly relations among nations based on respect for the principle of equal rights and self-determination of peoples, and to take other appropriate measures to strengthen universal peace; To achieve international co-operation in solving international problems of an economic, social, cultural, or humanitarian character, and in promoting and encouraging respect for human rights and for fundamental freedoms for all without distinction as to race, sex, language, or religion; and To be a centre for harmonizing the actions of nations in the attainment of these common ends.