''ethnicity" refers to people belonging to a common cultural identity,origin,history etc while "racial" has more to do with how people are categorized based on their physical traits.

Racial and ethnic achievement gaps narrowed substantially in the 1970s and 1980s. As some of the gaps widened in the 1990s, there were some setbacks in the progress the nation made toward racial and ethnic equity. This article offers a look below the surface at Black-White and Hispanic-White achievement gap trends over the past 30 years. The literature review and data analysis identify the key factors that seem to have contributed to bifurcated patterns in achievement gaps. The conventional measures of socioeconomic and family conditions, youth culture and student behavior, and schooling conditions and practices might account for some of the achievement gap trends for a limited time period or for a particular racial and ethnic group. However, they do not fully capture the variations. This preliminary analysis of covariations in racial and ethnic gap patterns across several large data sets has implications for future research on the achievement of minority groups.

ethnic means: connected with or belonging to a nation, race or people that shares a cultural tradition.(same race) racial means: happening or existing between people of (different races).