The formation of the united nations was a response to

The United Nations (UN) is an intergovernmental organization to promote international co-operation and to create and maintain international order. A replacement for the ineffective League of Nations, the organization was established on 24 October 1945 after World War II in order to prevent another such conflict.

the second world war.

Explanation:

It was a post-war desire for international cooperation. The United Nations is an intergovernmental organization to promote international cooperation and create and maintain international order.