Please note that Panama has several residency-by-investment programs. Citizenship is an additional process that can take years, and only starts when the applicant has at least five years with his permanent residency.
How could Panama citizenship help me obtain a U.S. E-2 visa?
Is Panama a treaty country with the U.S.? If I obtain Panama citizenship through its citizenship-by-investment program, would I be able to apply for an E-2 visa in the U.S. and set up a business there?
There’s no treaty establishing any type of benefit between Panamanian citizens and U.S. E-2 visas.
The currency used day to day in Panama is the U.S. dollar, which is also legal tender. For this reason, Panama is considered a dollarized country and was the second economy on the continent to become a dollarized economy. Panama as a country doesn't have an intentional agreement following your questions with the U.S. government, In fact, Panama City Beach, Florida, in the U.S. don't have any relation, only in the name. The U.S. E-2 visa is like the Golden Visa for Europe. You must hire an immigration attorney in the U.S. for that.
Panama is a treaty country with the U.S. Therefore Panamanian citizens are eligible for the U.S. E-2 visa, upon proper legal assistance with a U.S. immigration attorney.