today in history September 14th on this day in 1901 a moment that forever changed American history after the tragic death of President William McKinley who was assassinated just days earlier by Anarchist Leon cholos Theodore Roosevelt was sworn in as the 26th president of the United States at just 42 years old Roosevelt became the youngest person ever to hold the office Roosevelt's Dynamic leadership ushered in the Progressive Era a period of sweeping reforms from business regulation to the preservation of natural landscapes through conservation efforts Roosevelt reshaped the presidency asserting its role both domestically and internationally thanks for tuning in for today in history like share and subscribe to quizley 365