Going back to the third millennium BC and the 2nd Millennium BC doesn't reveal a great deal about European history. I will need more sources for this. I did a little bit in Middle Eastern history of the early first millennium BC.  I did a little bit of work through classical and medieval periods.

I also added a few more cities to the knowledge base: Singapore, Guadalajara, Mexico, Alexandria, Egypt, and Chittagong, Bangladesh now have pages.

I also began to move Poona, India, St. Petersburg, Russia, Kuala Lumpur, Malaysia, and Nanking, China into the main body of history.

One of the sources I am now using for some of my study of World history is "A History of World Societies". 3rd ed, by McKay, Hill, and Buckler.  I find that this is now in an 8th edition, but I don't have the means or inclunation to pursue a newer one. I will be using other sources, anyway, since I have learned over the years not to trust any one textbook  for anything.

I decided to go back to the history end to work on reversing the connections to nations.

The third millennium BC in Europe seems to be connected to the transition from Neolithic culture (new stone age) to the Bronze age. This starts getting into rather specialized archeology, and my various sources don't say much about it yet.  The nations of Europe are starting to get the 2nd millennium BC chopped into bits, but since there are so few records, I have little detail. Asia and the Middle East are getting the early 1st millennium subdivided. This is getting into Biblical times and places, although many of the appropriate nations are small and will have bo be done later.

Middle Eastern peoples and India have had early classical times sliced up by century, and the rest of Asia has been getting late classical times divided. Africa has begun getting early medieval times divided, and the Americas are getting late medieval times divided.

I haven't done much with modern history, except that all the cities that have a significant 18th century history have been connected. 

It took me a bit longer than I had expected, but the connections of the subdivisions of culture to nations have now been reversed, as far as I had then developed. I've started on the subdivisions of Anthropology, but havent quite finished.

I have reached something of a milestone. The Anthropology, Personal studies, and Science main headings have all had their connections to nations reversed, so that all 144 nations (and the groups they are part of) now have connections to these topics.  The program of making these reverse connections that I  set out  at the beginning of the year is now mostly done. There is still quite a bit to do in history, and there are various topics at the deeper levels (such as the divisions of culture, several divisions of anthropolgy) that still need reverse connections, but I hope to get these mostly done by the end of the month. After that, I expect to be doing more studies in religion and government, and whatever else seems to be demanded.

I've resumed the project of developing nations by reversing the links from particular subjects. Western Civilization and Asiatic peoples now have good links to Anthropology.  Anglic peoples, Latin peoples, and Germanic peoples have good links to Personal Studies.