How do you say I am from the US in Cantonese?

There are a few ways to say "I am from the US" in Cantonese, depending on the level of formality and context:

Formal:

* 我係美國人 (ngo5 hai6 mei5 gwok3 jan4): Literally "I am an American person". This is the most common and direct way to say it.

* 我來自美國 (ngo5 loi6 zi6 mei5 gwok3): Literally "I come from America". This is a slightly more formal and polite way to say it.

Informal:

* 我係美國嚟 (ngo5 hai6 mei5 gwok3 lai4): Literally "I am from America". This is a more casual and everyday way to say it.

Using "America" vs. "United States":

* "美國 (mei5 gwok3)" refers to both "America" and "United States".

* You can use "美國 (mei5 gwok3)" to refer to the country itself, or you can use "美國 (mei5 gwok3)人 (jan4)" to refer to a person from the United States.

Other options:

* 我喺美國出世 (ngo5 hai6 mei5 gwok3 chut1 sai3): Literally "I was born in America". This emphasizes your origin.

* 我喺美國住 (ngo5 hai6 mei5 gwok3 zyu6): Literally "I live in America". This implies you are currently residing there.

Remember to adjust your tone and word choice based on the situation and the person you're speaking to.