The only thing I can see is some agencies might require you to be a US citizen. Other than that your language ability is a plus. Just keep working on your English ability and you should be fine. Even English ability is not a big deal. Just write your reports in a word processing program and run a spelling and grammar check on it. As far as accents go, have you listened to Americans? We have different accents depending on where you live. Heck I live next to two people (both from the area I live) and they each have a different accent. As long as you can speak well enough to be understood you should be fine.
But when a long train of abuses and usurpations, pursuing invariably the same object, evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new guards for their future security.
Translation for the intellectually challenged: If the government screws the people too much, it is the right and duty of the people to revolt and form a new government.