Name one major historical figure in American art and their contribution.

Georgia O'Keeffe is a significant figure in American art, celebrated for her iconic paintings that often focus on flowers and landscapes of the American Southwest. Her work is characterized by a unique blend of abstraction and realism, using bold colors and large-scale compositions that emphasize the beauty of natural forms. O'Keeffe's ability to capture the essence of her subjects while also evoking a sense of place contributed to her status as a leading figure in American modernism. Additionally, her artwork challenged traditional representations of nature and femininity in art, making her an influential voice within the art world.