Black Cavier ran the following schedule in 2011-2012:

Oct. 8, 2011. Australia
Oct. 22, 2011. Australia.
Nov 5, 2011. Australia.
Jan. 27, 2012. Australia.
Feb 11, 2012. Australia.
Feb. 18, 2012. Australia.
April 28, 2012. Australia.
May 12, 2012. Australia.
June 23, 2012: Royal Ascot. [b]Northern Hemisphere.
[/b]
All wins. She also had 5 races in the early part of the year of 2011 before the series of races shown above. In fairness, she didn't race again after the Ascot win until Feb. 2013. She had an injury and the trainer said she didn't cope well with the 11k mile journey.

Others may be able to comment better but I don't think Turf racing in 'merika is thought to be a place to conquer by the rest of the world.