The site was first settled around 650, but mound building didn't start until 1050. The site was abandoned around 1400.
three
a long time
it take 2 days
It took 273 days for them to build the pyramid
It takes a long time...
it took 27years to build interstate 75.
how long does it take to build a asimo
how long did it take to build the half moon
how long did it take to build the scottish parliment?
how long did it take to build cabot tower
The original theory was that they used baskets of dirt, and that may still hold true for smaller mounds. Recent studies show that much more complex methods were required for the larger mounds (although they don't give examples of what that may have been).
hs2 will take 15 years to build
how long does it take to build a beam bridge of 2400 sq ft
it took 3 years
How long did it take to build st James cathedral london
a long time
how long did it take to build seaworld in sandiego
3 years to build the mcg