What was a common justification for U.S. expansionism in the late 19th century?

The belief in Manifest Destiny played a significant role in justifying U.S. expansionism in the late 19th century. This concept was rooted in the idea that it was the divine right and duty of the United States to expand its territory across the North American continent. Supporters argued that this expansion would bring civilization, democracy, and economic opportunities to less developed areas. The belief that Americans were destined to spread their way of life fueled ambitious policies that led to territorial acquisitions and the establishment of American influence beyond the continental borders.

While the other options reflect some motives for expansion during this era, they do not capture the predominant ideological driving force as vividly as Manifest Destiny. Economic independence, strategic military considerations, and the promotion of democracy were indeed aspects of the broader narrative, but they were often framed within the larger context of Manifest Destiny, which provided the moral and philosophical rationale for expansionist ambitions.