experts still did not know why the civilisations came to an end - whether the people converted en masse to Islam, or were captured by Arab slave traders.
Mr Insoll told the BBC very little was known about civilisations in the area between 600 and 1200 AD because no written history was kept and the societies ceased to exist when Islam arrived.
thats kinda weird, since there were arabic historians writing about those cultures as they were encountered or conquered:
Strictly speaking, ghana was the title of the king, but the Arabs, who left records of the kingdom, applied the term to the king, the capital, and the state. The
ninth-century Arab writer Al Yaqubi described ancient Ghana as one of the three most organized states in the region (the others being Gao and Kanem in the central Sudan). Its rulers were renowned for their wealth in gold, the opulence of their courts, and their warrior-hunting skills. They were also masters of the trade in gold, which drew North African merchants to the western Sudan. The military achievements of these and later western Sudanic rulers and their control over the region's gold mines constituted the nexus of their historical relations with merchants and rulers of North Africa and the Mediterranean.[4]
Ghana succumbed to attacks by its neighbors in the
eleventh century,
Code:
http://en.wikipedia.org/wiki/History_of_Ghana
luckily for the experts, they didn't encounter evidence of very early civilizations, otherwise they would be likely ridiculed or even worse, banned from universities and forced towards societies margins, for having different opinion than the officially accepted scientific theories (aka dogmas) of the time (look for 'forbidden archeology' video to see what i mean)
it's fair to say that people from far away times were as intelligent, if not in some cases, more intelligent on things such as astronomy or even other things. I am sure that you've come across such news or documentaries explaining how intelligent ancient peoples were in comparison to us with all our technology and wisdom.
it can be also said that this particular period of human history (ancient civilizations and before them) is quite controversial, considering many achievements from those days are unimaginable even today (take for example the egyptian pyramids or mayan calendar), meaning that our so called 'modern/advanced' society/technology/... aren't really that developed at all, that much knowledge was already established, yet for some reason suppressed/hidden and then later reinvented just so that some industry can profit from it (an example would be herbal/natural medicine vs. artificial pharma drugs) and those who stumble upon some evidence were shoved aside & gagged...another example is mentioned above considering archeology and, as usual, there is much more of it, than meets the mainstream media eye
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