How did the united states react to the soviet union�s development of an atomic bomb in 1949?

it initiated the non-proliferation treaty.
it launched a full scale attack on the soviet union.
it initiated peaceful negotiations with the soviet union.
it began to develop a weapon more powerful than the atomic bomb.

"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.