Rav Kook says (Ein Aya Shabbat2:5):
???? ?? ?’ ?? ????? ???? ??? ???? ??? ???? ????? ???? ?? ??? ????? ???? ?”? ???? ?????? ???????, ??”? ???? ??????? ?????, ????? ????? ??? ???? ?’ ?? ???? ??? ???? ??? ????? ???? ???? ???. ???? ?????? ???????? ??? ??? ??”? ????? ??????, ?? ???? ??? ?????, ????? ???? ?? ????? ??????, ?? ????? ??? ?? ????? ???? ?????? ?? ???????? ???????? ???? ???? ????, ?”? ???? ?????? ????? ??? ???? ?????? ??????. ??? ?? ??’ ?????? ???? ????? ?”? ???? ????? ?? ??????? ?????? ?????, ??? ???? ?????? ????? ?????? ????? ???? ?’ ????? ???? ???. ?”? ?? ?’ ????? ????? ????? ????? ????’ ???? ?????? ??? ???? ?”? ????? ?????? ????????? ???????? ?????.
There are aspects of gentile ideologies that can undergo “giur” but much is outside the pale such that the ideologies need only be referenced when they are popular.
As for American culture, much was taken from us as the Anglo-American philosophers of the 17th-19th centuries were lovers of Tanach. The English legal philosopher John Selden even learned from Rabbi Menashe ben Yisrael, who also taught Hugo (DeGroot) Grotius, the father of international law. Of course, much is distorted as they saw it through a Xtian prism but much is actually Jewish. IMHO, those who are seeking to preserve American traditions realize this and this is why they are so supportive of Israel.