Why does the US play a leading role in world affairs?

The U.S. plays a leading role in world affairs due to its significant economic power, military capabilities, and influence in international institutions. As one of the largest economies, it shapes global trade and finance, while its military presence allows it to project power and promote stability. Additionally, the U.S. is a key player in organizations like the United Nations and NATO, helping to establish international norms and policies. Its cultural influence, through media and technology, further extends its reach and leadership on the global stage.