Postmodernism in American literature challenged traditional narratives and embraced fragmentation. Authors like Pynchon, DeLillo, and Morrison explored themes of cultural chaos, media saturation, and identity through innovative techniques such as non-linear storytelling and metafiction. This literary movement emerged post-WWII, reflecting societal disillusionment and technological change. It continues to influence contemporary works, blending high and low culture while critiquing power structures and exploring the instability of meaning in our increasingly complex world.