The U.S.A. Trilogy is a series of three novels that chronicle the lives of various characters in the first half of the 20th century in the United States. The narrative intertwines the stories of twelve characters as they navigate the societal changes and upheavals of the era, including World War I, the Great Depression, and the rise of Hollywood. The author uses a unique narrative technique that combines traditional prose, newspaper-style headlines, biographies, and stream-of-consciousness writing to paint a vivid picture of American life during this period.

The novel chronicles the life of Christopher Tietjens, an officer in the British Army during World War I, and his complex relationships with two women: his adulterous wife Sylvia and a young suffragette named Valentine. The story is set against the backdrop of a changing society and the devastation of war, exploring themes of duty, honor, and the struggle between traditional values and modernism.

This novel is a World War I allegory where a Christ-like figure emerges within a French regiment, sparking a mutiny. The figure, a corporal, persuades his squadron to not attack in the bloody conflict, leading to their court-martial and execution. The narrative explores themes of war, morality, and the human spirit, with the corporal's actions causing a ripple effect, impacting the lives of soldiers, officers, and even a Jesuit priest.