What is the main purpose of the United Nations?

The primary purpose of the United Nations is to promote international cooperation and maintain peace among nations. Established after World War II, the UN seeks to foster a collaborative framework where countries can work together to address global issues such as conflict resolution, humanitarian aid, human rights, and sustainable development.

The emphasis on promoting international cooperation is central to its mission, as it provides a platform for dialogue and negotiation, helping to prevent conflicts and resolve disputes. This focus on peacekeeping and diplomacy is a fundamental aspect of the UN's role in the world, making it recognized as a vital entity for maintaining international order and security.

While other options present various important concepts, they do not reflect the overarching goal of the UN as effectively as the promotion of international cooperation and peace. For instance, while establishing a global currency system could contribute to economic stability, it is not the core function of the UN. Similarly, the UN is not primarily focused on promoting military alliances or enforcing national laws, as it is designed more for mediation rather than imposition of legal authority.