We have the report of a Ghanaian-American dual citizen, recently naturalized, presenting their new USA passport at the UK border answering "yes" to the question "have you ever had any problems with immigration anywhere" and getting in some trouble (although no refusal).
We have the CBP answering in essence, the two passports of a dual citizen are completely independent.
Is it the person or is it the nationality? Is the question "have you ever had any problems with immigration anywhere" to be understood on its face value, where "you" is the biological person or is it "you as a citizen of the country your passport you are presenting to us" and they do not give this tirade every time because for the overwhelming majority of passengers the two are the same? Is your new passport a clean slate? Or do you carry the problems resulting from the heightened scrutiny of your other citizenship forever? Is it possible for a border guard to swipe my Canadian passport and be aware of the history of my Hungarian passport? How entwined are my two inner citizens :) ?
Let's restrict the question to those who have at least one citizenship in the Five Eyes countries (Australia, Canada, New Zealand, the United Kingdom and the United States) and one of the Five Eyes borders.