The primary reason for establishing the United Nations (UN) in 1945 was to promote international cooperation and prevent future conflicts following the devastation of World War II. The founders aimed to create a global organization that would foster peace, security, and human rights through dialogue and collective action. The UN sought to address critical issues such as humanitarian crises, economic development, and environmental challenges while upholding the principles of equality and justice among nations. The establishment of the UN marked a significant step towards creating a framework for collaborative problem-solving on a global scale.