The following is the kind of historical Monday morning quarterbacking I despise, and leads me to question the intent and knowledge of the authors:
McGinnis also noted that the problem with the original Constitution, regarding the exclusion of blacks and women, has largely been corrected.
Slaves were outside of the civil society and had no rights. Women weren't entirely free either, for they depended on husbands, who would presumably tell them how to vote. In the vernacular of the day, neither groups "had a will of their own." And, it was and is up to the states to determine the qualifications of electors to the House, and since 1913, the Senate.
Fixed that for you.