See R. W. Albright, History of the Evangelical Church (1942, repr. 1956); J. W. Owen, A Short History of the Church of the United Brethren in Christ (1944).
The Evangelical United Brethren subsequently merged with The Methodist Church on the 23rd of April 1968 to form the United Methodist Church. The EUB congregations in Canada joined into the United Church of Canada, a previous (1925) merger of Methodists, Congregationalists, and some Presbyterians. In the Philippines, the EUB congregations joined the Philippine Methodist Church, Christian Church (Disciples), Presbyterian Church, Congregational Church, Iglesia Evangelica Unida de Cristo, Iglesia Evangelica Nacional and some segments of the Iglesia Evangelica Metodista En Las Islas Filipinas (IEMELIF) to formed the United Church of Christ in the Philippines.
The United Brethren took a strong stand against slavery, beginning around 1820. After 1837, slave owners were no longer allowed to remain as members of the United Brethren Church. In 1853, the Home, Frontier, and Foreign Missionary Society was organized.
Expansion occurred into the western United States, but the church's stance against slavery limited expansion to the south. By 1889, the United Brethren had grown to over 200,000 members with six bishops. In that same year they experienced a division. Denominational leaders desired to make three changes: to give local conferences proportional representation at the General Conference; to allow laymen to serve as delegates to General Conference; and to allow United Brethren members to hold membership in secret societies. The denominational leadership made these changes, but the minority felt the changes violated the Constitution because they were not made by the majority vote of all United Brethren members. One of the bishops, Milton Wright (the father of aviation pioneers Wilbur Wright and Orville Wright), disagreed with the actions of the majority. Bishop Wright and other conference delegates left the meeting and resumed the session elsewhere. They believed that the other delegates had violated the Constitution (and, in effect, withdrawn from the denomination), and deemed themselves to be the true United Brethren Church.
Until 1946 two groups operated under the name Church of the United Brethren in Christ, though the minority was known as the Church of the United Brethren in Christ (Old Constitution). In 1946, the larger United Brethren branch merged with the Evangelical Church to form the Evangelical United Brethren Church. In the same year, with cooperation of three other denominations, it formed the United Andean Indian Mission, an agency that sent missionaries to Ecuador. The Evangelical United Brethren Church in turn merged with the Methodist Church in 1968 to form The United Methodist Church. The present United Brethren Church is descended from the minority who organized under the leadership of Bishop Milton Wright.