LOS ANGELES - California Gov. Arnold Schwarzenegger said that some Mexican immigrants "try to stay Mexican" when they come to the United States, and he urged them to assimilate into the fabric of American society. Recalling his own experience emigrating from his native Austria, the Republican governor said Thursdya that immigrants should learn English and U.S. history and "make an effort to become part of America." "That is very difficult for some people to do especially, I think, for Mexicans because they are so close to their country here so they try to stay Mexican but try to be in...