A person from the United States; someone who holds US citizenship or is commonly regarded as American.
彼女は米国人で、東京に留学している。
She is American and is studying in Tokyo.
観光地には多くの米国人旅行者が訪れていた。
Many American tourists were visiting the sightseeing spots.
米国人と日本人では文化や慣習が異なる場合がある。
There can be cultural and customary differences between Americans and Japanese.