How did the egyptian workers cooperate to build to pyramids?

They are enslaved

At that time, building the pyramid was regarded as the most labor harsh architectural projects, considering the minimum technological development that exist at that time. Because of this, they obtained a lot of slaves from both Europe and Africa and force them as workers to build the pyramid.

think its caste system

explanation:

this headline suggests that midterm congressional   elections are at the corner and trump administration wants to activate his base by vowing to clamp down on immigrants and immigration as trump had said during his election campaign around two years ago. when a baby is born in usa, the baby becomes citizen of usa for 85 years and trump wants to end this rule of birthright citizenship to control illegal immigration and this what he said in an interview""we’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the united states for 85 years, with all of those benefits,” "