My choice would be; An american family a book written by Khizr Khan and in it you may learn about the values that better define true american people, these are; family links only surpassed by patriotism for explaining this I will say that:
American people live in family union by decision, but if a proof of patriotism is required they are always ready and even eager to show respect and devotion to the country.
Something also important is the pursue of the american dream and I think this book embraces well these three aspects of true american culture.