Money flows towards trust and stability. Decade after decade America has proven that they, regardless of the sometimes zany politics that goes on, have the ability to generate new sources of wealth. It has just the right balance of education, legal system, taxation, policing and infrastructure to support continued innovation. People are not subject to random persecution on a large scale and generally left to get on with their lives as any normal country should do. The rich can definitely probe and poke at loopholes in the laws, because they can afford vast teams of lawyers, but are generally susceptible to the same laws because the juries or judges are less corruptible than other jurisdictions. This is why the dollar continues to thrive.