Good post.  My deep and long American history also includes adoptions, and was highlighted greatly to our family last year when my father did a genetic spit test : our previously 'english' heritage really was more German, along with eastern european jew and 'iberian peninsula'.  Why did we 'forget' our 'shameful' German backgrounds, easy :  WWI and WWII we served here for the USA.  Why was our darker skin 'iberian' forgotten : my family was full of racists, plain and simple.  Just watching an NFL game with my grandfather who I loved dearly, was sometimes very painful when he would go on and on about blacks who he did not call black but every derogatory name in the book.

America is a great place to be, freedom and liberty are here to stay.  It only took 2 generations to wipe out religion in our family, and as many generations to wipe out our racist points of view for at least some of us ... we are truly mixing pot Americans, and I wouldn't have it any other way.  USA! USA! USA!