Most Christian groups and individual denominations have long expressed ideals of being reconciled with each other, and in the 20th century, Christian ecumenism advanced in two ways. One way was greater cooperation between groups, such as the Edinburgh Missionary Conference of Protestants in 1910, the Justice, Peace and Creation Commission of the World Council of Churches founded in 1948 by Protestant and Orthodox churches, and similar national councils like the National Council of Churches in Australia which includes Roman Catholics. The other way was institutional union with new United and uniting churches. Congregationalist, Methodist, and in 1977 to form the Uniting Church in Australia. The Church of South India was formed in 1947 by the union of Anglican, Baptist, Methodist,Congregationalist, and Presbyterian churches.
The Christian Flag Steps towards reconciliation on a global level were taken in 1965 by the Roman Catholic and Orthodox churches mutually revoking the excommunications that marked their Great Schism in 1054; the Anglican Roman Catholic International Commission (ARCIC) working towards full communion between those churches since 1970; and the Lutheran and Roman Catholic churches signing the Joint Declaration on the Doctrine of Justification in 1999 to address conflicts at the root of the Protestant Reformation. In 2006, the World Methodist Council, representing all Methodist denominations, adopted the declaration. Another example of ecumenism is the invention of and growing usage of the Christian Flag, which was designed to represent all of Christendom. The flag has a white field, with a red Latin cross inside a blue canton.