I said that a million Chinese were buried under the Great Wall but a million
worked on it over the centuries while thousands or possibly hundreds of
thousands are buried within it.  The first wall was built in the second century BC.
It was the attempt to keep other Chinese tribes or ethnicities apart in order to
curb the constant attacks of the Warring States period.  Every third male was
employed to build it.
Most of the wall was built during the Ming Dynasty .