Who holds veto power in the united nations security council?
a. britain and the u. s.
c. all permanent members
b. 10 members
d. all members

this article will :

rosevelt. 1973. "slaves everywhere"

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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the northwest ordinance of 1787 guaranteed basic rights for settlers and banned slavery there.