What justifications did American offer for and against expansionism?

Answer 1

American justifications for expansionism included the belief in Manifest Destiny, the idea that the U.S. was destined to expand its territory across North America, spreading democracy and civilization. Proponents argued that expansion would provide economic opportunities, enhance national security, and fulfill a moral obligation to uplift "lesser" cultures. Conversely, opponents highlighted the ethical concerns of displacing indigenous populations, the potential for increased conflict with other nations, and the moral implications of slavery's expansion into new territories. They argued that such actions contradicted the founding principles of liberty and justice.