During the 1840s, the idea of Manifest Destiny was used to A demand equal rights for African Americans
B support westward expansion to the Pacific
C criticize government treatment of Native American Indians
D extend slavery into New England

B

Explanation:

manifest destiny means the colonists thought they had a right (destiny) to expand the union territory towards the west, which pushed out native americans and allowed the United States to become a much larger area

answer; i believe the above statement is (true);

c) troops march forward in close formation against newer, more accurate weapons