The groups of people who were NOT invited to the Constitutional Convention in 1787 because they were not considered citizens included Native Americans, African Americans, and Women.
While white men who owned property were the primary participants and were generally considered the political eligible class at that time, the other groups listed were largely excluded from the political process and did not have the same rights or status as citizens. Delegates for each colony/state were indeed present, but the aforementioned groups were not represented.