developed into civilizations that revolved around city life in Mesopotamia , Egypt , the Indus Valley , and China Other ancient societies such as the Hebrews , Phoenicians and ="-family: Arial,Helvetica,sans-serif; -size: 90%; letter-spacing: 0px; line-height: 19px;"> Kush ="-family: Arial,Helvetica,sans-serif; -size: 90%; line-height: 19px;"> emerged later in this era. Mild climate,