Progressive Party (United States, 1912)
As a member of the Republican Party, Roosevelt had served as President from 1901 to 1909, becoming increasingly progressive in the later years of his presidency. In the 1908 presidential election, Roosevelt helped ensure that he would be succeeded by Secretary of War Taft. After Taft took office, he hewed closer to the conservative wing of the party and this and other actions alienated Roosevelt from his former friend. Progressive Republican leader Robert La Follette had already announced a challenge to Taft for the 1912 Republican nomination, but many of his supporters shifted to Roosevelt after the former President decided to seek a third presidential term, which was permissible under the Constitution prior to the ratification of the Twenty-second Amendment. At the 1912 Republican National Convention, Taft narrowly defeated Roosevelt for the party's presidential nomination. After the convention, Roosevelt, Frank Munsey, George Walbridge Perkins and other progressive Republicans established the Progressive Party and nominated a ticket of Roosevelt and Hiram Johnson of California at the 1912 Progressive National Convention. The new party attracted several Republican officeholders, although nearly all of them remained loyal to the Republican Party—in California, Johnson and the Progressives took control of the Republican Party.
Ulster Unionist Party
The Ulster Unionist Party traces its formal existence back to the foundation of the Ulster Unionist Council in 1905. Before that, however, there had been a less formally organised Irish Unionist Alliance (IUA) since the late 19th century, usually dominated by unionists from Ulster. Modern organised unionism properly emerged after William Ewart Gladstone's introduction in 1886 of the first of three Home Rule Bills in response to demands by the Irish Parliamentary Party. The IUA was an alliance of Irish Conservatives and Liberal Unionists, the latter having split from the Liberal Party over the issue of home rule. It was the merger of these two parties in 1912 that gave rise to the current name of the Conservative and Unionist Party, to which the UUP was formally linked (to varying degrees) until 1985.