What event involving the US brought the desire to begin an expansionist policy with regard to foreign affairs?

The desire for expansionist policy in the United States was significantly fueled by the aftermath of the Spanish-American War in 1898. This conflict resulted in the U.S. acquiring territories such as Puerto Rico, Guam, and the Philippines, marking a pivotal shift towards Imperialism. The war underscored a growing belief in manifest destiny and the idea that the U.S. had a role to play on the global stage, prompting further interest in foreign territories and influence. This expansionist sentiment was driven by economic interests, national security concerns, and a belief in American exceptionalism.