He, his parents, and three grandparents are American. One grandparent was San Marinese, so he qualified for citizenship there. I don't think you can really call him San Marinese in a cultural sense. It was a smart decision for him to represent San Marino though. He would likely not have made the USA team as only one entrant per country is allowed in each weight class. The USA entrant won the gold in that weight class today.Oh and San Marino has won a third medal!
Most successful nation per capita at Tokyo 2020!