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.

It's most likely B

Explanation: Trade is an important part of these groups. So the language will also be spread between them during trade .

theodore roosevelt challenged william to a duel, whoever won, got their policy sent to congress. it ended up in a stalemate, and both men were injured and sent to the hospital.

for the united states of america, 1945 to 1964 was a time of high economic growth and general prosperity. it was also a time of confrontation as the capitalist united states and its allies politically opposed the soviet union and other communist countries; the cold war had begun.

explanation: