Is the American accent hard to perfect? For most of the people on our list of actors doing American accents, the answer is no. For others, though, it's near impossible.
Hollywood is all about faking it, and that extends to actors faking American accents. Some of the actors doing American accents on our list (like Margot Robbie in The Wolf of Wall Street and Christian Bale as Batman) have even better accents than actual Americans. And then... some of them do not (sorry, Michael Caine in The Cider House Rules).
For a lot of actors and actresses, their fake American accents are perfected with the help of dialect coaches. Yet for some, like Toni Collette, it's all about "a misspent youth watching too much American television," as she told USA Today. Regardless of whether an actor nails the accent or not people, fans will always debate their performance, as was evidenced by the split reviews of Benedict Cumberbatch's Boston accent in Black Mass. We'll let you be the judge of that one.
So take a look at our list of actors doing American accents and feel free to leave your own critique of whether they nailed it or not.