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I won't disagree with you on African Americans or women, intersection being Black women. But John Rutledge the slaveholding lawyer: 
"When the proposal was made that only landowners should have the right to vote, Rutledge opposed it perhaps more strongly than any other motion in the entire convention. He stated that making such a rule would divide the people into "haves" and "have nots", would create an undying resentment against landowners, and could do nothing but cause discord. He was supported by Benjamin Franklin, and the rule was not adopted."
The U.S. Constitution's requirements to hold federal office don't contain property requirements and all 3 branches' federal officials get a salary from the U.S. Treasury--IIRC the UK didn't even pay its MP's (members of Parliament) until 1911 (House of Lords veto abolished). There were poll taxes and property requirements to vote, but the USA was way ahead of Western Europe for White male "universal" suffrage (by 1860 all White male citizens could vote).
The system has been broken for a long time:

Mississippi’s Legislature is thoroughly controlled by white Republicans, who have redrawn districts over the past 30 years to ensure they can pass any bill without a single Democratic vote. >

a cardinal mistake in the American Experiment. >

Not doing away with the Lost Cause and seditionists through a coordinated national effort after the Civil War ended was a cardinal mistake in the American Experiment. >

Wouldn't the cardinal mistake be when the constitution was written? The founders never made equality a reality for black people, women, or the poor.