National dress is usually appropriate. If you are not sure what to wear and the invitation does not give you an idea, just ask. If you receive a letter or invitation to an event at someone's home and it says RSVP, you should respond by either writing a note or by calling the person. If unavoidable problems make you change your mind about attending, inform those who are expecting you as far in advance as possible. Cultural preferences or religious restrictions as applied to food are understood, so just explain this to your hosts if you are offered food which you do not want or are not supposed to eat.
American culture is very fluid and complex with many subcultural groups whose values differ.
Even with this diversity it is possible to mention certain characteristics which in general describe attitudes and practices that are common among Americans, and which tend to distinguish Americans from people who have grown up in other cultures. Keep in mind the following remarks are generalizations. You will find individuals who are exceptions to all of them. Individualism Americans generally believe that the ideal person is an autonomous, self-reliant individual. Most Americans see themselves as separate individuals, not as representatives of a family, community, or other groups.