I was perusing the Wikipedia List of Female Astronauts.
Something I noticed from this: if you remove U.S. women astronauts, the list is really short. Of 56 women who have made it into space (out of 530 total space travelers as of Jan. 2013), US=45, rest of world=11 (USSR/RUS-3; CAN-2; JPN-2; UK-1; FRA-1; KOR-1; CHN-1). It shifts slightly if you consider mixed citizenship: IND/USA-1; IRN/USA-1.
Interpret this as you will.