It has been a while since I have studied it, but I believe that the Clergy was represented by the First Estate.
The two things that this three countries have in common are that they are all predominantly Christian countries, and that all three of them have access to sea.
Mexico, Finland, and Ghana, are all predominantly Christian countries. They all fall into different branches of Christianity though, and the percentages vary, with Mexico having the highest, and Ghana the smallest percentage of the population practicing this religion.
All of the countries mentioned have access to sea. This has been and still is very important for their economic development because they are all able to dictate their own economies and their own trade with whoever they want.
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Pyramids were built for the burial of Egypt's ruler. Many workers were hired for its building, it took at least 30 years to build one pyramid, so there were many workers and engineers.
