premise: As of the 2010 United States Census, there were 244,826 people, 90,218 households, and 66,335 families residing in the county. The population density was . There were 95,554 housing units at an average density of . The racial makeup of the county was 81.2% white, 12.7% black or African American, 2.4% Asian, 0.3% American Indian, 0.1% Pacific islander, 0.9% from other races, and 2.5% from two or more races. Those of Hispanic or Latino origin made up 3.5% of the population. In terms of ancestry, 28.1% were German, 19.8% were Irish, 12.2% were English, 9.9% were Italian, 6.8% were Polish, and 6.2% were American.
hypothesis: Italian, Polish and American made up less than 10% of ancestry