Not true at all. Rednecks make Rednecktowns all over the US. Southern Ohio, for example, has a huge population of Appalachians who, like dirty Mexicans fording the Rio Grande, scurry back and forth across the Ohio River, over many generations, building families in both the North and South. Interestingly, Cincinnati ended up passing laws banning (no joke) discrimination against Appalachian-Americans.
Back in the day, the Appalachians (again like the Mexicans) also brought crime and social dysfunction with them, shitting up Cincinnati's suburbs until the Blacks moved in to show them how you really shit up a city.
West African immigrants to the US (never dealt with Ethiopians) are the master race.