Explorers who used celestial navigation plotted their courses according to
a. the ship's distance from the equator.
b. the position of the sun, the moon, and the stars.
c. the magnetic pull of the north and south poles.
d. the distance between lines of latitude and longitude.

"the plan of removing the aboriginal people who yet remain within the settled portions of the united states . . approaches its consummation. . an extensive region . . has been assigned for their permanent residence. it has been divided into districts and allotted among them. many have already removed and others are preparing to go. . " removal of southern indians to indian territory, 1835 this passage is most closely related to a) imperialism. b) the civil war. c) westward expansion. d) the french indian war.