Asked by Anonymous

Where did the first great river valley civilizations develop and how did they expand?
Answered by Writeacher
http://www.google.com/search?q=ancient+river+civilizations&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GGIE_en
Answered by Connexeus girl
I NEED HELP PLEASE MY OVER ALL GRADE IS 48%
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