For most of the history of this country, differences between the black and the white population--whether in income, IQ, crime rates, or whatever--have been attributed to either race or racism. For much of the first half of the 20th century, these differences were attributed to race--that is, to an assumption that blacks just did not have it in their genes to do as well as white people. The tide began to turn in the second half of the 20th century, when the assumption developed that black-white differences were due to racism on the part of whites.

Three decades of my own research lead me to believe that neither of those explanations will stand up under scrutiny of the facts. As one small example, a study published last year indicated that most of the black alumni of Harvard were from either the West Indies or Africa, or were the children of West Indian or African immigrants. These people are the same race as American blacks, who greatly outnumber either or both.

If this disparity is not due to race, it is equally hard to explain by racism. To a racist, one black is pretty much the same as another. But, even if a racist somehow let his racism stop at the water's edge, how could he tell which student was the son or daughter of someone born in the West Indies or in Africa, especially since their American-born offspring probably do not even have a foreign accent?

What then could explain such large disparities in demographic "representation" among these three groups of blacks? Perhaps they have different patterns of behavior and different cultures and values behind their behavior.

There have always been large disparities, even within the native black population of the U.S. Those blacks whose ancestors were "free persons of color" in 1850 have fared far better in income, occupation, and family stability than those blacks whose ancestors were freed in the next decade by Abraham Lincoln.
What is not nearly as widely known is that there were also very large disparities within the white population of the pre-Civil War South and the white population of the Northern states. Although Southern whites were only about one-third of the white population of the U.S., an absolute majority of all the illiterate whites in the country were in the South.

The North had four times as many schools as the South, attended by more than four times as many students. Children in Massachusetts spent more than twice as many years in school as children in Virginia. Such disparities obviously produce other disparities. Northern newspapers had more than four times the circulation of Southern newspapers. Only 8% of the patents issued in 1851 went to Southerners. Even though agriculture was the principal economic activity of the antebellum South at the time, the vast majority of the patents for agricultural inventions went to Northerners. Even the cotton gin was invented by a Northerner.

Disparities between Southern whites and Northern whites extended across the board from rates of violence to rates of illegitimacy. American writers from both the antebellum South and the North commented on the great differences between the white people in the two regions. So did famed French visitor Alexis de Tocqueville.

None of these disparities can be attributed to either race or racism. Many contemporary observers attributed these differences to the existence of slavery in the South, as many in later times would likewise attribute both the difference between Northern and Southern whites, and between blacks and whites nationwide, to slavery. But slavery doesn't stand up under scrutiny of historical facts any better than race or racism as explanations of North-South differences or black-white differences. The people who settled in the South came from different regions of Britain than the people who settled in the North--and they differed as radically on the other side of the Atlantic as they did here--that is, before they had ever seen a black slave.

Slavery also cannot explain the difference between American blacks and West Indian blacks living in the United States because the ancestors of both were enslaved. When race, racism, and slavery all fail the empirical test, what is left?

Culture is left.

The culture of the people who were called "rednecks" and "crackers" before they ever got on the boats to cross the Atlantic was a culture that produced far lower levels of intellectual and economic achievement, as well as far higher levels of violence and sexual promiscuity. That culture had its own way of talking, not only in the pronunciation of particular words but also in a loud, dramatic style of oratory with vivid imagery, repetitive phrases and repetitive cadences....