Why do americans circumcise their baby boys but their european cousins don't?

Cultural. It has become an unnecessary habit in the U.S. Based on false long term health issues. Maybe the europeans have caught on.
Culture/availability. In Britain, the government health care doesn't cover circs, and rates run 10%. In France, about 30%, in the US it varies from 60-90% depending on ethnic and religious factors. I remember one British Navy officer who had his 3 boys done it the US Naval hospital while he was stationed here for studies.