The York Rite Sovereign College of North America exists primarily to be of service to the York Rite of Freemasonry. Constituent colleges must declare fealty to the Grand Lodge of their respective jurisdictions. The pre-requisite for membership, which is by invitation only, is good-standing in all four York Rite bodies: Lodge, Chapter, Council and Commander.

The first York Rite College was constituted on June 15, 1957 in the City of Jackson, Michigan. From here, the new organization spread rapidly from coast to coast and from north to south and by 1970 Colleges had been established in fourteen States and one Province of Canada.
Membership in a College is by invitation, and is restricted to those who hold membership in all of the other York Rite bodies. Since the primary object of every College is to foster a spirit of service and to promote and support the York Rite in every way possible, it is no surprise to find many of the leaders of the Craft numbered among its ranks. Here they find a common ground from which the can act for the welfare of all York Rite bodies without special favor to any. Colleges have been active in the organization of York Rite Festivals, degree teams, drill corps, and many other functions which serve to assist, coordinate, and unify the Rite.

(source: https://yrscna.org/about-yrsc/)