Describe how and why Theodore Roosevelt was described as the first Progressive president

Theodore Roosevelt Jr., often referred to as Teddy Roosevelt or his initials T. R., was an American statesman, politician, conservationist, naturalist, and writer, who served as the 26th president of the United States from 1901 to 1909. He previously served as 33rd governor of New York from 1899 to 1900 and the 25th vice president of the United States from March to September 1901. Roosevelt emerged as a leader of the Republican Party and became a driving force for the anti-trust policy while supporting Progressive Era policies in the early 20th century. His face is depicted on Mount Rushmore alongside George Washington, Thomas Jefferson, and Abraham Lincoln.

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