@civfanatic he has replied :
1. The Late Harappan Period extended from 1900 BC - 1000 BC. Check the Time Line on Harappa.com:
Indus Civilization Introduction.
You can also check the IVC page on Wikipedia. The following observation has been made by Jim Shafer: "However, the Indus Valley Civilization did not disappear suddenly, and many elements of the Indus Civilization can be found in later cultures. Current archaeological data suggest that material culture classified as Late Harappan may have persisted until at least c. 1000-900 BCE and was partially contemporaneous with the Painted Grey Ware culture." (Shaffer, Jim (1993). "Reurbanization: The eastern Punjab and beyond".)
2. Check the Wikipedia Page for the Assyrian culture. This is what it says:
"The period from 1200 BC to 900 BC was a dark age for the entire Near East, North Africa, Caucasus, Mediterranean and Balkan regions, with great upheavals and mass movements of people.
Assyria and its empire were not unduly affected by these tumultuous events for some 150 years, perhaps the only ancient power that was not. However, upon the death of Ashur-bel-kala in 1056 BC, Assyria went into a comparative decline for the next 100 or so years. The empire shrank significantly, and by 1020 BC Assyria appears to have controlled only areas close to Assyria itself, essential to keeping trade routes open in eastern Syria, south eastern Asia Minor central Mesopotamia and north western Iran."
Therefore, Assryria suffered a sudden decline for a period of 100 years from 1056 BC - 9056 BC. It was the only ancient power that was not affected to a very large extent.
3. I have mentioned in the article that "The period from 1070 BC – 664 BC is known as the "Third Intermediate Period" of Egypt, during which time Egypt was run over and ruled by foreign rulers, and there was political and social disintegration and chaos. Egypt was increasingly beset by a series of droughts, below-normal flooding of the Nile, and famine". This can be easily fact checked by anyone having doubts.
4. The Olmec civilization also suffered major damages. Again check the Wikipedia page for the Olmec culture: This is what it states: "A wholesale destruction of many San Lorenzo monuments also occurred circa 950 BCE, which may indicate an internal uprising or, less likely, an invasion. The latest thinking, however, is that environmental changes may have been responsible for this shift in Olmec centers, with certain important rivers changing course."
5. All of this is in addition to the destruction and calamities in Greece, North Africa and Near East.
Clearly this was a worldwide collapse of civilization at around the same time i.e. c. 1000 BC, which coincides with the transition from the descending to the ascending Yuga Cycle.
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We can follow it up here if you like -
Myths, Symbols and Mysteries: The end of the Kali Yuga in 2025: Unraveling the mysteries of the Yuga Cycle
Regards,
Virendra