In the United States those who want to provide architectural services must be licensed. To become licensed one must earn a professional degree in architecture, complete a period of practical training or internship, and pass all divisions of the ARE (Architect Registration Examination). In most states, continuing education is required to maintain licensure.
Generally, the professional degree in architecture must be from a school of architecture accredited by the National Architectural Accrediting Board (NAAB). A few states don't have this requirement.