Theodore Roosevelt was the 26th President of the United States, serving from 1901 to 1909. He was known for his energetic personality and progressive policies, which included trust-busting and conservation efforts. Roosevelt was a key figure in the Progressive Era, advocating for reforms that aimed to address social issues and improve the lives of ordinary Americans. Roosevelt was also a war hero, having led the Rough Riders during the Spanish-American War. His leadership style and commitment to public service left a lasting impact on the nation, making him one of the most memorable presidents in American history.