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After McKinley's assassination, President [[Theodore Roosevelt]] tapped McKinley's Industrial Commission for his trust-busting ideas and continued the federal and nationalist policies of his predecessor. In order to ensure fair competition in the economy Roosevelt took steps to abolish "trusts" or cartels which then dominated many key markets within the economy. This led Republicans into conflict with the most powerful commercial interests in the country, led by John D. Rockefeller, the richest man in the world.

After McKinley's assassination, President [[Theodore Roosevelt]] tapped McKinley's Industrial Commission for his trust-busting ideas and continued the federal and nationalist policies of his predecessor. In order to ensure fair competition in the economy Roosevelt took steps to abolish "trusts" or cartels which then dominated many key markets within the economy. This led Republicans into conflict with the most powerful commercial interests in the country, led by John D. Rockefeller, the richest man in the world.

Roosevelt decided not to run again in 1908 and chose [[William Howard Taft]] to replace him, but the widening division between progressive and conservative forces in the party resulted in a third-party candidacy for Roosevelt on the United States Progressive Party, or "Bull Moose" ticket in the election of 1912. He finished ahead of Taft, but the split in the Republican vote resulted in a decisive victory for Democrat [[Woodrow Wilson]], temporarily interrupting the Republican era.

Roosevelt decided not to run again in 1908 and chose [[William Howard Taft]] to replace him, but the widening division between progressive and conservative forces in the party resulted in a third-party candidacy for Roosevelt on the United States Progressive Party, or "Bull Moose" ticket in the election of 1912. Roosevelt finished ahead of Taft, but the split in the Republican vote resulted in a decisive victory for Democrat [[Woodrow Wilson]], temporarily interrupting the Republican era.

The party controlled the presidency throughout the 1920s, running on a platform of high tariffs, the promotion of business interests, opposition to the League of Nations, and overall isolationism after Wilson's turbulent internationalism. [[Warren G. Harding]], [[Calvin Coolidge]] and [[Herbert Hoover]] were resoundingly elected in 1920, 1924, and 1928 respectively. These years saw the party firmly committed to laissez-faire economics, but the Great Depression cost it the presidency with the election of [[Socialism|socialist]] Democrat [[Franklin Delano Roosevelt]] in 1932. Roosevelt's New Deal Coalition controlled American politics for the next two decades, concluding with the two-term presidency of popular Republican World War II General [[Dwight Eisenhower]].

The party controlled the presidency throughout the 1920s, running on a platform of high tariffs, the promotion of business interests, opposition to the League of Nations, and overall isolationism after Wilson's turbulent internationalism. [[Warren G. Harding]], [[Calvin Coolidge]] and [[Herbert Hoover]] were resoundingly elected in 1920, 1924, and 1928 respectively. These years saw the party firmly committed to laissez-faire economics, but the Great Depression cost it the presidency with the election of [[Socialism|socialist]] Democrat [[Franklin Delano Roosevelt]] in 1932. Roosevelt's New Deal Coalition controlled American politics for the next two decades, concluding with the two-term presidency of popular Republican World War II General [[Dwight Eisenhower]].