If conceptualism retains what is correct in universalism and in nominalism and conceptualism offers an adequate explanation of the phenomena under consideration, then it solves the problem.
The first question is answered in the Transcendental Aesthetic (doctrine of the faculty of perception), the second in the Transcendental Analytic (doctrine of concepts and judgments).
As a young man, I chafed against books that dismissed the notion of American exceptionalism; got into long, drawn-out arguments with friends who insisted the American hegemon was the root of oppression worldwide.