In the mid-1800s, democrats believed that a policy of manifest destiny
a .would prevent a war with nations that claimed territory in north america. b .was less important than developing existing territory in the united states. c .would boost the american economy and open up economic opportunities. d. would prevent hostilities with american indian tribes that lived in the west.

would boost the American economy and open up economic opportunities.

Option C.

Explanation:

Would boost the American economy and open up economic opportunities, is the right answer.

In the United States during the 19th century Manifest destiny was popularly held idea. According to this belief, its settlers were intended to extend beyond North America. This belief was comprised of three basic themes:

1. The extraordinary qualities of the people of America and their organisations

2. The goal of the U.S. to reclaim and reconstruct the west in the form of agrarian U.S

3. A powerful chance to achieve this fundamental duty

i think the answer is true

the right answer is a