Which choice is the key reason for the rise of the Mayas, Aztecs, and Incas in Central and South America A) development of astronomy B) development of farming and trade C) development of roads and bridges D) development of weaponry

"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.