Which president was known for forming the Progressive Party?

The formation of the Progressive Party is closely associated with Teddy Roosevelt, who was a former president and a key figure in the early 20th-century Progressive Movement. After serving two terms as president from 1901 to 1909, Roosevelt sought a third term in the election of 1912. When he was unable to secure the Republican nomination against William Howard Taft, he broke away and formed the Progressive Party, often referred to as the "Bull Moose Party." This new party focused on progressive reforms, including women's suffrage, workers' rights, and addressing the ills of industrialization and corporate monopolies. Roosevelt's leadership and the platform he presented established the Progressive Party as a significant third party during that election cycle.

In contrast, the other individuals listed were not associated with the formation of the Progressive Party. Bill Clinton and Ronald Reagan were presidents known for their own political ideologies and parties (Democratic and Republican, respectively) but did not play a role in the Progressive Movement or party formation. George Wallace was known for his segregationist stance and ran for president in the late 20th century but did not form the Progressive Party. Therefore, Roosevelt stands out as the founder of this movement and party.