Historical country data source information
Primary source:
Wolfram|Alpha Knowledgebase, 2024.
Background sources and references:
 - 
  Cahoon, B. M. WorldStatesmen.org. »  
 
 
 - Grun, B. and E. Simpson. The Timetables of History: A Horizontal Linkage of People and Events. (4th ed.) Touchstone, 2005. 
 
 - 
  Lahmeyer, J. Population Statistics. »
 
 
 - Scarre, C. Smithsonian Timelines of the Ancient World. DK ADULT, 1993. 
 
 - Teeple, J. B. Timelines of World History. DK ADULT, 2006.
 
 - 
  The Wikimedia Foundation, Inc. Wikipedia. »
 
 
 - Wiltshire, K. The British Museum Timeline of the Ancient World. (1st ed.) Palgrave Macmillan, 2004. 
 
                    
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