Reuters: Americans are angry with BP because of the massive oil spill in the Gulf of Mexico, but most do not associate the company with its British origins and do not believe the accident should harm relations with the close U.S. ally. Some British business leaders, politicians and newspapers worry that their country is being attacked by the White House over the ruptured deep-sea well that has allowed millions of gallons of crude oil to gush into Gulf for nearly two months. But some …