Title: History of the Republican Party (United States)
Content:  states did not hold primaries, but instead selected delegates via state conventions. For years Roosevelt had tried to attract Southern white Democrats to the Republican Party, and he tried to win delegates there in 1912. However Taft had the support of black Republicans in the South, and defeated Roosevelt there. Roosevelt led many (but not most) of his delegates to bolt out of the convention and created a new party (the Progressive, or "Bull Moose" ticket), in the election of 1912. Few party leaders followed him except Hiram Johnson of California. Roosevelt had the support of many notable women reformers, including Jane Addams. The Roosevelt-caused split in the Republican vote resulted in a decisive victory for Democrat Woodrow Wilson, temporarily interrupting the Republican era.
Title: 1912 United States presidential election
Content:  was renominated on the first ballot. Sherman was the first sitting vice president re-nominated since John C. Calhoun in 1828. After losing the vote, Roosevelt announced the formation of a new party dedicated "to the service of all the people." This would later come to be known as the Progressive Party. Roosevelt announced that his party would hold its convention in Chicago and that he would accept their nomination if offered. Meanwhile, Taft decided not to campaign before the election beyond his acceptance speech on August 1. Not since the 1884 election had there been a major schism in the Republican Party, when the Mugwump faction repudiated nominee James G. Blaine and broke with the party. The schism, in which Roosevelt had nearly participated after fighting Blaine's nomination, was a major factor in Blaine's loss to Grover Cleveland.
Title: 1912 Republican National Convention
Content:  This convention marked the climax of a split in the party, resulting from a power struggle between incumbent Taft and former president Theodore Roosevelt that started in 1910. Politically liberal states for the first time were holding Republican primaries. Though Roosevelt had endorsed Taft as his successor, Taft's drift to the right had alienated Roosevelt, who launched a challenge to Taft's re-nomination. Roosevelt overwhelmingly won the primaries — winning 9 out of 13 states. Both Taft and Roosevelt lost their home states to each other. Senator Robert M. La Follette, a reformer, won two states, including his home state of Wisconsin. Through the primaries, Senator La Follette won a total of 36 delegates; President Taft won 
Title: Warren G. Harding
Content:  Ohio to campaign for Harding, but their quarrels split the Republican Party and helped assure Harding's defeat. The party split grew, and in 1912, Taft and Roosevelt were rivals for the Republican nomination. The 1912 Republican National Convention was bitterly divided. At Taft's request, Harding gave a speech nominating the president, but the angry delegates were not receptive to Harding's oratory. Taft was renominated, but Roosevelt supporters bolted the party. Harding, as a loyal Republican, supported Taft. The Republican vote was split between Taft, the party's official candidate, and Roosevelt, running under the label of the Progressive Party. This allowed the Democratic candidate, New Jersey Governor Woodrow Wilson, to be elected.
Title: History of the Republican Party (United States)
Content:  In 1912, Roosevelt broke with Taft, rejected Robert M. La Follette, and tried for a third term, but he was outmaneuvered by Taft and lost the nomination. The 1912 Republican National Convention turned a personal feud into an ideological split in the GOP. Politically liberal states for the first time were holding Republican primaries. Roosevelt overwhelmingly won the primaries—winning 9 out of 12 states (8 by landslide margins). Taft won only the state of Massachusetts (by a small margin); he even lost his home state of Ohio to Roosevelt. Senator Robert M. La Follette, a reformer, won two states. Through the primaries, Senator La Follette won a total of 36 delegates; President Taft won 48 delegates; and Roosevelt won 278 delegates. However 36 more 
Title: 1916 Republican National Convention
Content:  The 1916 Republican National Convention was held in Chicago from June 7 to June 10. A major goal of the party's bosses at the convention was to heal the bitter split within the party that had occurred in the 1912 presidential campaign. In that year, Theodore Roosevelt bolted the GOP and formed his own political party, the Progressive Party, which contained most of the GOP's liberals. William Howard Taft, the incumbent president, won the nomination of the regular Republican Party. This split in the GOP ranks divided the Republican vote and led to the election of Democrat Woodrow Wilson. Although several candidates were openly competing for the 1916 nomination—most prominently conservative Senator Elihu Root of New York, Senator John W. Weeks of Massachusetts, and liberal Senator Albert Cummins of Iowa—the party's 
Title: 1912 Republican Party presidential primaries
Content:  work within the party. The rift spilled over into Michigan, where local conventions in the summer became polarized over Roosevelt. Intra-party tension cost the Republicans dearly in the midterm 1910 United States elections. Their major defeat was in Congress. In the Senate, the Democrats took ten seats from the Republicans, cutting the margin in half. The Democrats took control of the U.S. House, defeating 45 incumbent Republicans to move from a 47-vote deficit to a majority of 67. In gubernatorial races, the Democrats took Idaho, Maine, and New Jersey, while the Republicans took Nebraska, Nevada, and Tennessee. An Independent was elected in Wyoming, taking that seat out of 
Title: 1912 United States presidential election
Content:  to his nomination. The party was divided into two main factions. The conservative faction led by Congressman Victor L. Berger of Milwaukee promoted pragmatic democratic reform, fought corruption, and opposed immigration as both a wage suppressant and drain on public resources. The radical faction sought to overthrow capitalism, tried to infiltrate labor unions, and sought to cooperate with the Industrial Workers of the World (IWW or "Wobblies"). It supported immigration to increase ranks for the war on capitalism. With few exceptions, the party had weak or nonexistent links to local labor unions. Many of these issues had been debated at the First National Congress of the Socialist Party in 1910 and again at 
Title: History of conservatism in the United States
Content:  the Left on domestic issues regarding courts, unions, railroads, big business, labor unions and the welfare state. By 1910–11, Roosevelt had broken bitterly with Taft and the conservative wing of the GOP. In 1911–12 he took control of the insurgency on the left, formed a third party, and ran an unsuccessful campaign for president on the Progressive Party ticket in 1912. His departure left the conservatives, led by President William Howard Taft, dominant in the Republican party until 1936. The split opened the way in 1912 for Democrat Woodrow Wilson to become president with only 42% of the vote. The result was that liberalism prevailed for 8 years.
Title: 1912 United States House of Representatives elections
Content:  Elections to the United States House of Representatives in 1912 were held for members of the 63rd Congress, coinciding with the election of President Woodrow Wilson. Wilson's victory was partly due to the division of the opposition Republican Party into conservative and progressive factions. While many progressives stayed within the party framework, they maintained lukewarm relationships with Republican leadership. Others formed a third party known as the Progressives and several switched allegiance to the Democrats. A message of unity was portrayed by the Democrats, allowing this group to present themselves as above the bickering and corruption that had become associated with the Republican internal feud. Many of the new seats that were added after the prior census ended up in Democratic hands. In addition, William Kent, who had been elected to the House as a Republican in 1908, was elected to California's 1st congressional district as an Independent. The number of representatives was increased for this election to 435, where it currently stands (aside from 1959 when Alaska and Hawaii were admitted as states).

Question: what led to the split of the republican party in 1912?
Answer: Zachariah Chandler.