The document lists key people, events, inventions, and cultural trends from each decade of the 20th century, starting from the 1920s. Some highlights include the stock market crash, radio, jazz, and Winnie the Pooh in the 1920s; World War 2, Snow White, Monopoly, and Jesse Owens in the 1930s; the end of World War 2, Rosie the Riveter, penicillin, and Superman in the 1940s; television, Sputnik, rock and roll, and the polio vaccine in the 1950s; the Vietnam War, the Peace Corps, the civil rights movement, and the moon landing in the 1960s; Watergate, women's rights, Earth Day, and