What is the primary purpose of the United Nations?

The primary purpose of the United Nations, which centers on maintaining world peace, is integral to its mission as established in the UN Charter. The UN was created in the aftermath of World War II with the primary aim of preventing another global conflict of such magnitude. It strives to facilitate international cooperation, secure peace, and stabilize regions vulnerable to conflict. This involves mediating disputes between countries, deploying peacekeeping forces, and conducting diplomatic negotiations to foster peaceful relations.

While the other options reflect important issues that the UN does address—such as environmental protection through programs like the UN Environmental Programme, assistance in trade through organizations like the World Trade Organization, and promoting cultural exchange via initiatives like UNESCO—they are not the fundamental reason for the UN's establishment. The organization's overarching concern remains with maintaining and promoting world peace, which serves as the foundation for all its other activities.