"A Life in the Twentieth Century" is a memoir written by Arthur Schlesinger Jr., an American historian, social critic, and public intellectual. In this book, Schlesinger reflects on his experiences and observations throughout the 20th century, a period marked by significant social, political, and cultural changes. Schlesinger, who lived from 1917 to 2007, was deeply engaged with the major events and personalities of his time. He served as an adviser to President John F. Kennedy and was a prolific writer on American history and politics. In "A Life in the Twentieth Century," Schlesinger offers insights into key historical moments, including World War II, the Cold War, the Civil Rights Movement, and the rise of the United States as a global superpower. He also reflects on his personal relationships and intellectual development against the backdrop of these larger historical forces. Overall, the book provides readers with a unique perspective on the 20th century from someone who witnessed and participated in many of its defining moments. Schlesinger's memoir offers valuable insights into the complexities of modern American history and the challenges and opportunities it presented.