Nevertheless, some prominent scholars, such as Samuel P. Huntington in "Who Are We? The Challenges to America's National Identity", have expressed the view that the most accurate explanation for modern-day United States culture and inter-ethnic relations can be found somewhere in a fusion of some of the concepts and ideas contained in the melting pot, assimilation, and Anglo-conformity models. Under this theory, it is asserted that the United States has one of the most homogeneous cultures of any nation in the world. This line of thought holds that this American national culture derived most of its traits and characteristics from early colonial settlers from Britain, Ireland, and Germany. When more recent immigrants from Southern and Eastern Europe brought their various cultures to America at the beginning of the 20th century, they changed the American cultural landscape just very slightly and, for the most part, assimilated into America's pre-existing culture, which had its origins in Northwestern Europe.