Can someone help me with the blanks. Thank you

Which of the following is an effect that constantine's conversion to christianity had on the roman empire?

Which of the following was probably the most difficult challenge facing construction of the railroad?

"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.