Ooh, with an American accent? So, Canadian, British, Australian, New Zealand, whatever. Yup aint nobody able to do an American accent, nope no way, gotta be an American, maybe.
As a rule & phonetically, australian and new zealand accents are much more difficult to imitate than ‘standard’ american or even canadian. I say ‘standard’ because southern accent in the US, for example, is again harder to imitate than ‘standard’.