Which novel won the Pulitzer Prize for Fiction in 1921 and was Edith Wharton's first Pulitzer?

The novel that won the 1921 Pulitzer Prize for Fiction and became Edith Wharton's first Pulitzer was The Age of Innocence.

Published in 1920, the novel is set among New York's wealthy upper class during the 1870s Gilded Age. Its central character, Newland Archer, is engaged to May Welland but becomes emotionally drawn to her unconventional cousin, the Countess Ellen Olenska. Through their conflict, Wharton examines social rules, marriage, reputation, and the pressure to conform.

The award was historically notable because Wharton became the first woman to win the Pulitzer Prize for Fiction. A common mix-up concerns Sinclair Lewis's Main Street: the fiction jury reportedly preferred Lewis's novel, but the Pulitzer board ultimately selected Wharton's book. The Age of Innocence was later adapted into a 1993 film directed by Martin Scorsese, starring Daniel Day-Lewis, Michelle Pfeiffer, and Winona Ryder.