What was one effect of the Spanish-American War on U.S. foreign policy?

The choice indicating that the Spanish-American War marked the beginning of American imperialism is correct because the conflict represented a significant shift in U.S. foreign policy from isolationism to a more interventionist and expansionist approach. Following the war, the United States acquired territories such as Puerto Rico, Guam, and the Philippines, which established the U.S. as an imperial power.

This expansion into foreign territories was a departure from the earlier practice of avoiding entanglement in overseas conflicts, demonstrating a newfound willingness to engage militarily and politically beyond its borders. The war also led to debates about the implications of imperialism on American values and identity, setting the stage for future interventions in Latin America and Asia.

In contrast, options referring to isolationist policies or focusing solely on European affairs do not align with the immediate outcomes of the Spanish-American War, which expanded U.S. interests globally rather than retracting them. Additionally, the idea that the war ended all military conflicts is inaccurate since it did not eliminate future military engagements but instead positioned the U.S. in a role where such conflicts became more likely.