The body came into being in Seattle, Washington in 1931 by the merger of two American bodies that practiced congregational church governance, the National Council of the Congregational Churches of the United States and the General Convention of the Christian Church. Initially using the word "and" between the words "Congregational" and "Christian," the new denomination decided to combine the predecessor churches' identities into one nationally, while its constituent churches remained free to either retain their original names or adopt the new usage.