What effect did nationalism have on U.S. foreign policy during imperialism?

Nationalism had a profound effect on U.S. foreign policy during the era of imperialism, particularly by fostering a sense of superiority over other nations. This belief in superiority was heavily influenced by the idea of Manifest Destiny, which initially justified westward expansion across the continent and eventually extended to overseas territories. Many Americans felt that it was their duty to spread American ideals—such as democracy, liberty, and capitalism—to what they perceived as "less developed" countries.

This sense of superiority often manifested in a more aggressive foreign policy approach, as the U.S. sought to assert its influence around the globe. The notion that Americans were superior not only propelled expansionist ambitions but also justified interventionist actions in other nations, where the U.S. aimed to impose its values and governance structures. This mindset contributed to events like the Spanish-American War and the subsequent annexation of territories such as Puerto Rico, Guam, and the Philippines.

While other options might touch on elements of the broader context of U.S. foreign relations during this period, they do not adequately capture the specific influence nationalism had in promoting a belief in American superiority and its justification for imperialistic practices.