the term American girl is common used by an eastern person. so, i will assume you are from an eastern culture.
American women are heavily influenced by feminism. this is hell for you as the submissive women of the east will easily follow your lead but the American women are more masculin, opinionated and holds her individuality with much more ego. this can translate into a less nurturing, more argumentative, and selfish lover.
a risky ordeal... women file for 80 percent of divorce and blondes file more for divorce than anyone and brunettes are second in line... both being caucasians too.