Alpha Gamma Delta and Zeta Tau Alpha in 1909, Delta Zeta in 1910, Phi Mu in 1911, and Kappa Delta in 1912. No new members were admitted for the next few decades. Throughout its early years, the NPC organizations were often racially and religiously segregated and rarely admitted Jewish, Catholic, or minority ethnic members, which led to the formation of group-specific sororities which attempted to provide the same social and academic outlets to groups who were otherwise excluded from membership. These groups included the first Black Greek letter organizations. By 1922, the Conference (as of then still named the National Panhellenic Congress) had a structure of an executive committee consisting of a chairman, secretary, and treasurer; a publicity board; and a delegate board with at least one representative from each of its 18 senior members. That year, the Congress also began plans for its own centralized Panhellenic headquarters to coordinate and streamline interactions with the separate sororities. Shortly before its merger with the NPC, the AES was part of a larger multi-panhellenic association, the Council of Affiliated Panhellenics. Created in 1941, it had the AES, NPC and the Professional Panhellenic Association as members. AES merger and new memberships Members of Sigma Sigma Sigma and Alpha Sigma Alpha organized the Association of Pedagogical Sororities on July 10, 1915. The membership consisted of sororities which were primarily located on state campuses predominantly attended by women entering the educational field. In 1917, Pi Kappa Sigma and Delta Sigma Epsilon joined the association, followed by Theta Sigma Upsilon in 1925, Alpha Sigma Tau in 1926, and Pi Delta Theta in 1931. At the third biennial conference, the name of the association was changed to the Association of Educational Sororities (AES). Later, the word "Educational" was changed to "Education". From 1915 through 1926, the NPC and AES operated chapters in the same colleges and universities. In 1926, the NPC and AES made an agreement "defining fields of activities of each panhellenic". There was competition between NPC and AES sororities, and dual memberships were often held. By the 1940s, however, many teacher's colleges had begun to add liberal arts programs, and vice versa, which led to difficulties in functioning separately as they had had in the past. On November 12, 1947, at a conference in Colorado Springs, Colorado, the NPC considered and granted associate membership "with reservations" to the six AES sororities. The AES was holding