Will a psychology degree from the US qualify me for professional practice in foreign countries?

In most cases, it does not. In the United States, the legal basis for licensure in this field is determined by state or territory. This legality, along with the training and education of psychologists varies from country to country. At present, there is no international recognition of equivalence of degrees in professional psychology qualifications. Therefore, if you want to work in another country, under some other board, you are advised to research and contact them well in time for all relevant information.