PLZ HELP!! No links plz! Or you will be reported.. Which best explains how rivers promoted the interaction between pre-historic groups?

A. They protected groups from invasion,

B. They allowed for easy movement to other regions,

C. they kept separate most of the time,

D. They let groups divide and form unique cultures.

Which statement in the passage best reflects sumer's opinion of the dred scott decision? a."i speak what cannot be denied." b."[the] judgment was sustained by a falsification of history." b."the opinion was more thoroughly abominable than anything history." i speak what cannot be denied when i declare that the opinion of the chief justice in the case of dred scott was more thoroughly abominable than anything of the kind in the history of courts. judicial baseness reached its lowest point on that occasion. you have not forgotten that terrible decision where a most unrighteous judgment was sustained by a falsification of history. -charles sumner, 1865