Speaking before a group of prospective college students touring the university from various countries, nathan focused on how the american education system is the best and most effective in the world. many of the visiting students reacted negatively toward nathan. what caused the students' reaction to nathan?

It is because of his ethnocentrism

Explanation:

Ethnocentrism is a term that refers to the fact that someone thinks that their Culture,ethnicity,nationality,religion and race is better than that of other people .

This belief may make someone thinks that people need to convert into his or her religion or they need to start doing things that his or her nation does because the person believes that theirs(culture,nation, religion etc) is the only thing that is the best in the world.

Nathan says the American education is the only best and effective in the world and this probably offended these other students who come from other countries.