because they believed in afterlife so they built the pyramids to put the dead kings in to keep them safe.
In terms of grammar, both are acceptable. However, I would recommend using "Egyptians built pyramids" because implicit in the usage of the present perfect (the "have done something" tense) is that the action has continued to the present, which is not the case as concerns Egyptians building pyramids.
The Egyptians built pyramids as the tombs of their kings.
The ancient Egyptians built the pyramids for pharaohs in the afterlife.
The Egyptians built the pyramids as buril places for the pharoahs.
No. The pyramids were built by real people - the Egyptians.
Built pyramids.
pyramids
No they were built by the Egyptians
No, they built pyramids
The Egyptians.
Over ramids were built by the Egyptians.
the egyptians
Mayans and the ancient Egyptians