possible merger with three historically African-American Methodist denominations: the African Methodist Episcopal Church, the African Methodist Episcopal Zion Church, and the Christian Methodist Episcopal Church. A Commission on Pan Methodist Cooperation and Union formed in 2000 to carry out work on such a merger. In May 2012, The United Methodist Church entered into full communion with the African Methodist Episcopal Church, African Methodist Episcopal Zion Church, African Union Methodist Protestant Church, Christian Methodist Episcopal Church, and Union American Methodist Episcopal Church, in which these Churches agreed to "recognize each other's churches, share sacraments, and affirm their clergy and ministries." There are also a number of churches such as the Evangelical Methodist Church in Argentina, Evangelical Church of Uruguay, and Methodist Church in India (MCI), that are "autonomous affiliated" churches in relation to the United Methodist Church. The UMC is a member of the Wesleyan Holiness Consortium, which seeks to reconceive and promote Biblical holiness in today's Church, and many United Methodist congregations are members of the Christian Holiness Partnership, with ten percent of local church membership in the Christian Holiness Partnership being from the United Methodist connexion. It is also active in the World Methodist Council, an interdenominational group composed of various churches in the tradition of John Wesley to promote the Gospel throughout the world. On July 18, 2006, delegates to the World Methodist Council voted unanimously to adopt the "Joint Declaration on the Doctrine of Justification", which was approved in 1999 by the Vatican and the Lutheran World Federation. Membership trends Like many other mainline Protestant denominations in the United States, the United Methodist Church has experienced significant membership losses in recent decades. At the time of its formation, the UMC had about 11 million members in nearly 42,000 congregations. In 1975, membership dropped below 10 million for the first time. In 2005, there were about 8 million members in over 34,000 congregations. Membership is concentrated primarily in the Midwest and in the South. Texas has the largest number of members, with about 1 million. The states with the highest membership rates are Oklahoma, Iowa, Mississippi, West Virginia, and North Carolina. By the opening of the 2008 General Conference, total UMC membership was estimated at 11.4 million, with about 7.9 million in the US and 3.5 million overseas. Significantly, about 20 percent of the conference delegates were from Africa, with Filipinos and Europeans making up another 10 percent.