I would not recommend speaking English with an American accent, and I would also not encourage anyone to learn it.
It is like having chewing gum in your mouth when you speak with that accent.

It's painfully obvious Turnoi dislikes Americans. He has attacked the American accent once again.
Of course,let's not forget the best accent is the Russian one, when it comes to speaking English. That's why Russians are in great demand internationally to teach English as a foreign language, just as Turnoi is doing on the dark continent...lol!
Joking apart, the best spoken English emanates from Canada. So many Chinese employers are bending over backwards to hire Canadians like me!