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The Thoroughbred is a horse breed best known for its use in horse racing. Considered a "hot-blooded" horse, and known for its agility, speed and spirit, the Thoroughbred as it is known today was first developed in 17th and 18th century England, when native mares were crossbred with imported Arabian stallions. During the 18th and 19th centuries, the breed spread throughout the world; they were imported into North America starting in 1730 and into Australia, Europe, Japan and South America during the 19th century. Millions of Thoroughbreds exist worldwide today, with over 118,000 foals registered each year worldwide. Thoroughbreds are used mainly for racing, but are also bred for other riding disciplines, such as show jumping, combined training, dressage, polo, and fox hunting. They are also commonly cross-bred with other breeds to create new breeds or to improve existing ones, and have been influential in the creation of many important breeds, such as the Quarter Horse, the Standardbred, the Anglo-Arabian, and various warmblood breeds. Thoroughbred racehorses perform with maximum exertion, which has resulted in high rates of accidents and other health problems.