Around 4000 B.C. communities of people settled in the Yellow River Valley in what is today this country
The main 
food of the Yangshao people was millet, with some sites using foxtail .... Li, 
Xinwei (2013), "The later Neolithic in the central Yellow River valley, c.4000
3000 BC",... [DOC] [TLE] World History Timeline Middle East History 3500 BC - TimeMaps [PAR] History, map and timeline of the Middle East 3500 BC, showing the civilizations of 
Ancient Egypt and Mesopotamia emerging in river valleys.