General Social Survey respondents were asked: "When you think about yourself, how important is your ethnic group membership to your sense of who you are?" The table shows the correlations between the answer to this question and the answer about the degree to which the respondents feel warmth toward a specified group. For example, the top correlation shows that the more a Jewish person feels that his ethnicity is important, the cooler he feels toward whites.
I listed the correlations in descending order. The bottom one--.06--is the only one indicating a positive association: Mexican Americans who think their ethnicity is important are slightly more likely to feel warm toward whites.
For most groups, ethnocentrism predicts (weakly) coolness toward the outgroup. This is true of all white groups. Black ethnocentrism, on the other hand, is unrelated to feelings toward whites and Mexican-Americans.
With the noted exceptions, the correlations contradict my sociology professor who claimed that, as America becomes a truly multicultural country, it will be as warm and peaceful as diverse Switzerland.
At first glance, it might seem like ethnocentricity among minorities doesn't lead to anti-outgroup feelings, and while the data indicate that might be true for blacks and Hispanics, the tendency among Jews is the strongest on the list.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science, whatever the matter may be." ~ Lord Kelvin