Final answer:
Movies, music, and literature have built the United States' identity and impacted its culture. Movies have reflected societal attitudes and influenced cultural trends, while music has influenced fashion and given a voice to marginalized communities. Literature has sparked conversations and challenged societal norms.
Step-by-step explanation:
The national document that has built the United States' identity between the 1900s and 2020 is the cinema industry, specifically movies. Movies have had a significant impact on American culture by reflecting societal attitudes, shaping public opinion, and influencing cultural trends. For example, in the 1920s, the emergence of silent films contributed to the Roaring Twenties culture, while the films of the 1960s and 1970s reflected the countercultural movements of the time. In the modern era, movies continue to shape American culture through blockbusters and indie films that address current social issues and amplify diverse voices.
Another cultural document that has shaped the US identity is music. From jazz in the 1920s to the rock 'n' roll of the 1950s, music has reflected shifts in social attitudes, influenced fashion and trends, and provided a platform for marginalized communities to express themselves. Throughout history, artists like Louis Armstrong, Elvis Presley, and Madonna have left an indelible mark on American culture through their music and performances.
Lastly, literature has also played a significant role in building the nation's identity. The works of authors like F. Scott Fitzgerald, Langston Hughes, and Toni Morrison have captured the essence of different time periods and reflected the American experience. These literary masterpieces have sparked conversations, challenged societal norms, and shaped the way Americans view themselves and their history.