American Quarter Horses, Appaloosas, Paints and Arabians are the most famous mixed breeds of horses. Thus, American Quarter Horses appeared after crossbreeding of Arabian Barbs and English Thoroughbreds. Appaloosas were first bred by Native Americans, but after the European invasion, the purity and origin of the breed was called in question. Arabian horses arrived from the Middle East, and the influence of Barbs cannot be ruled out. Paint horses arrived in America from Europe.