Final answer:
Gamma Phi Beta is considered an international sorority due to its chapters located across the United States and Canada, making it a multi-country organization.
Step-by-step explanation:
Gamma Phi Beta is called an international sorority because it includes chapters in both the United States and Canada, thereby operating in more than one country. Sororities are generally classified as national or international based on their geographic scope and presence. In the case of Gamma Phi Beta, the sorority transcends national boundaries, which qualifies it as an international organization. The presence of such sororities on various campuses provides a network for members that spans across different countries, enhancing the sorority's cultural diversity and reach.