Once the largest Christian denomination in English-speaking Canada, in 1925 some 70 per cent of its congregations joined with the Methodist Church, Canada and the Congregationalist Union to form the "United Church of Canada." The terms "Continuing Presbyterians" and "Non-Concurring Presbyterians" were then used by those who did not participate in the merger, until the legal right to use the name "Presbyterian Church in Canada" was regained in 1939. The Supreme Court of Canada ruled that although the institutional Presbyterian Church in Canada may legally have merged with the Methodist Church, the United Church had effectively vacated the name and it remained available to the non-concurring Presbyterians. It also was a benefit to have support from Governor General Lord Tweedsmuir, and from Prime Minister William Lyon Mackenzie King.