Many Americans Justified westward expansion during the 1840's based on
(1) A belief in Manifest Destiny
(2) A need to preserve the natural environment
(3) The authority of Monroe Doctrine
(4) The constitutional principles in the Bill of Rights

(1) A belief in Manifest Destiny

Explanation:

Manifest Destiny, a phrase coined in 1845, is the idea that the United States is destined—by God, its advocates believed—to expand its dominion and spread democracy and capitalism across the entire North American continent. The philosophy drove 19th-century U.S. territorial expansion and was used to justify the forced removal of Native Americans and other groups from their homes.

Source

https://www.history.com/topics/westward-expansion/manifest-destiny

Number 1 is the correct answer

Explanation:

I remember this

they sometimes resort to unethical tactics.

both are true, the congress does have the power to create banks, even if this power is not specifically described in the constitution, since there is nothing restricting it and there is power given to the congress to make "all laws which shall be necessary and proper". maryland was not allowed to tax a branch of the national bank operating there, and the supreme court decided that no state could. both of these topics were discussed in a decision of the mcculloch v. maryland case in 1819.