Why did Russia switch sides and become a Central Power?

What happened 10 million years ago? if u answer, u get 50 ! plz answer ; -;

"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.

What were the advantages and dis- advantages of how britain and france ruled in africa?