It might help to know what 'person' actually means.
What was meant, when it was written, is perfectly clear. A little research into the change of language, the last 200 odd years, plus a casual review of the Federalist Papers, establishes the intent beyond any question.
Persons included full citizens (property owners), non voting citizens (non-property owners) and slaves.
Even our unenlightened First Fathers figured out that non property owners, having nothing to lose, would be the fatal flaw in a system where expenditures would be determined only through qualified citizens' voting for them.