The Women's Nations Cup is an international women's rugby union series organized jointly by USA Rugby, the RFUW (England) and Rugby Canada, and played each summer with rotating host locations. As well as the organisers, guest teams from other nations also take part. There are separate tournaments for U20 and senior sides. The first tournaments took place in 2008 with a U20 competition at Appleby College, Oakville, Ontario, Canada in July followed by a senior tournament at Esher, London, England in August. As well as England, USA and Canada, various editions have featured teams from France, Wales and South Africa.
Note: Information above is from Wikipedia - http://en.wikipedia.org/wiki/Women's_Nations_Cup_(rugby_union)
The US leg of the 2013 Nations Cup Women's Rugby Tournament in was held in Greeley, Colorado and Denver, Colorado. The tournament was between Canada, England, South Africa and the United States. The Winner of the tournament was Canada.