The Dubai World Cup is the richest with a $10 million purse
America's richest horse race is considered to be the Breeder's Cup, which did not start until the 1970s I believe.
The richest horse race in the whole of Africa is the Summer Cup run at Turffontein racecourse in Johannesburg, South Africa.
Phar Lap. One of NZ's best horses ever in the world
The Dubai World Cup Sponsored by Emirates is the richest Horse Race in the world. With a purse of US$6 Million it is clearly the biggest.
The richest man in the worlds race is Mexican, and he is Carlos Slim helu.
The Dubai Cup has a US$10 Million purse making it the richest race in the world. The race is held at Meydan Race Track in Dubai, UAE.
the derby is the largest horse race in the world.
Pleasanton 1858 Chester Race Course in the UK. First documented horse race was in 1539.
Yes the Kentucky Derby is the largest horse race in the world and it is also the oldest.