What was Georgia O'Keeffe's nationality?

Georgia O'Keeffe was American by nationality.

O'Keeffe was born in Wisconsin and became one of the leading figures in American modernism. Her career unfolded primarily in the United States, where she studied, taught, exhibited, and built a distinctive body of work.

Her art is often identified with American modernism because it combined simplified forms, enlarged flowers, New York skyscrapers, desert landscapes, bones, and abstract compositions. She developed these subjects independently rather than following European artistic conventions closely.

O'Keeffe spent important parts of her career in New York and New Mexico. Her move toward the Southwest led to paintings that became especially associated with the region’s cliffs, adobe buildings, skies, and desert objects. That regional association does not change her nationality: she remained an American artist throughout her life.