1912: Theodore Roosevelt fails to win the Republican party nomination and is nominated by the Progressive/Bull Moose Party. William Taft is the Republican nominee and the Democratic party nominates Woodrow Wilson. Roosevelt, fearing that Wilson will take progressive votes from him, campaigns against Wilson in several progressive leaning western states, where he accuses Wilson of being "the chosen candidate of the Democratic party political machine and banks." Wilson fails to respond to these attacks, and ultimately narrowly loses the election, with Roosevelt winning 273 electoral votes.
'1914: By 1914 progressive Democrats and Republicans have joined the progressive party, with moderates and conservatives joining the Republican party, which is renamed the "Conservative Party" Woodrow Wilson becomes a progressive and heals his relationship with Roosevelt.' Progressives take control of the house and senate, along with most northeastern and western state legislatures. An Amendment is passed for the Direct Election of Senators.
'1915: Women's suffrage is passed, as is the National Income tax.'
1916: Roosevelt is re-elected by a landslide over Conservative nominee Elihu Root.
1917: US declares war on Germany
1919: The treaty of Versailles is signed, with harsh reparations against Germany (as another POD, no Wilson means no League of Nations)
1920: Roosevelt declines to run for a third term, and Bob Lafolette is nominated by the Progressive party to oppose Conservative nominee Warren G. Harding. Lafolette appeals to isolationists by acknowledging his opposition to the Great War. Lafolette narrowly wins the election.
1922: Despite attempts by President Lafolette to avoid the prohibition issue, Lafolette ends up supporting prohibition.
1924: Continued regulations are placed on financial institutions. President Lafolette is re-elected due to a period of peace in the United States.
1925: President Lafolette dies, Vice President Al Smith becomes the first Roman Catholic ever to hold the presidency.
'1926: 'Smith announces his intention to repeal prohibition, and is opposed by "dry" progressives.
1928: Smith narrowly wins the Progressive party nomination, despite "dry" opposition, and is opposed by Conservative Calvin Coolidge, who ignores the issue. Coolidge wins the election by a landslide.