The excerpt would be of limited use to a historian seeking to explain the political position common in the 1990s that the United States should celebrate the diversity created by immigration.
The excerpt suggests a perspective that is more aligned with the position that the influence of new immigrant cultures should be reduced. The author argues that the education system should prioritize American culture over multiculturalism, which implies a preference for assimilation and a reduction of the influence of new immigrant cultures.
During the 1990s, there was a growing concern among many Americans about the impact of immigration on American society. This led to a political position that favored assimilation and reducing the influence of new immigrant cultures in areas such as education, language, and social norms. However, there was also a counter-movement that celebrated the diversity created by immigration and recognized the contributions of immigrants to American society.
Therefore, while the excerpt provides some insight into the political position common in the 1990s that the United States should reduce the influence of new immigrant cultures, it does not offer any support for the position that the United States should celebrate the diversity created by immigration.