Puerto Rico, Guam, American Samoa, the United States Virgin Islands, the Commonwealth of the Northern Mariana Islands, or any territory or possession of the United States. (12) Streamlined sales and use tax agreement The term Streamlined Sales and Use Tax Agreement means the multistate agreement with that title adopted on November 12, 2002, as in effect on the date of the enactment of this Act and as further amended from time to time. 5. Severability If any provision of this Act, or the application of such provision to any person or circumstance, is held to be unconstitutional, then the remainder of this Act, and the application of the provisions of such to any person or circumstance, shall not be affected thereby.