The founding fathers who wrote the constitution belong the the upper class level in society, you could also name them the “elite” class. They were educated, businessmen, as well as being landowners. The people who werent allowed to participate in the ratification/ writing of the constitution were the African Americans, Free African Americans ( all black people in general), Native Americans, women, and non-landowners.
The social class between early Unites states and present day United States was different in the sense of extreme segregation, and the necessary necessities that would put you in the upper level class. The two also has similarities as well, in both present day America and early America , they both used social class as an individual status, African Americans are still primarily at the bottom while wealthy white men are still primarily at an upper level status. Just like early America, to be able to be in an upper class level, education has to be involved (usually), and if you had that particular status you would more than likely be a businessman, or a land owner.
the people who wrote the constitution were very afraid of democracy. They didn’t want people following a “mob mentality” meaning they didn’t want popular opinions of society to influence chaos, they didn’t wany to give the people too much power, for example, the June 6th riot at the white house. They were also afraid of “Majority Tyranny”, they felt if a majorities decision of a certain situation would disregard and disinterest the minority group, undermining the rights of others.