Domesticated sunflower seeds have been found in Mexico dating to 4100 years ago, suggesting an independent domestication may have occurred there.

The flowers were employed in ceremonies, the dried stems utilized in construction and for fuel, and various other parts exploited for medicinal purposes.
Native Americans had selected a tall, single-headed variety by the time European explorers reached North America in the sixteenth century. By that time, the sunflower was a minor garden crop in much of North America. It was taken to Spain in 1569 for ornamental use.
Two centuries later, the plants were being grown for their oil on a large scale in France and Bavaria, and following this development, they moved farther eastward into eastern Europe and especially Russia.
History of sunflower in United States