What were all the supportive arguments for Manifest Destiny and westward expansion EXCEPT?

Answer 1

western lands were already claimed by other countries

Answer 2

Here are some major supportive arguments for Manifest Destiny and westward expansion:

1. Economic opportunity: Supporters argued that westward expansion would provide new land for agriculture, Natural Resources for extraction, and trade opportunities, leading to economic growth and prosperity for the rapidly expanding United States.
2. National security: Advocates believed that expanding westward would strengthen national security by establishing a buffer zone against potential foreign threats and expanding the American sphere of influence.
3. Spreading democracy and civilization: Supporters argued that the expansion would allow the United States to spread its democratic principles, values, and civilization to Native American tribes and other populations in the western territories. They believed it was the country's duty to bring progress to these areas.