Census data shows heritage of 317 million modern Americans Clusters show where immigrants from different nations chose to settle Largest ancestry grouping in the nation are of German descent with almost 50 million people African American or Black is the second largest grouping with just over 40 million people Almost 20 million people claim to have 'American' ancestry for political reasons and because they are unsure of their family's genealogy 49,206,934 Germans By far the largest ancestral group, stretching from coast to coast across 21st century America is German, with 49,206,934 people. The peak immigration for Germans was in the...