The concept of nationalism can significantly affect global cooperation by prioritizing national interest over international collaboration. Nationalist sentiments may lead nations to adopt more protective policies, distancing themselves from multilateral agreements and creating tensions in global relations. While nationalism can foster unity within a country, it often hinders collective action on issues like climate change, trade, and security. In a globalized world, competing national interests can slow progress on shared challenges, making it difficult for countries to work together effectively. Understanding this tension is crucial for navigating modern international affairs.