Clinton,
You have right to work in:
European Union
Norway
Iceland
Liechtenstein
Vatican City
To work in the US, you will need a work visa or green card, which are not easy to obtain. As a commercial pilot, your chances of getting sponsored are currently 0. Unless you are from Northern Ireland, you are ineligible for the green card lottery. Best bet are to invest significant amount of money or marry an American.
Every country has different rules, and they are usually designed to protect the jobs of their own citizens first.