Barry is a black man who has developed , and thus can imagine how he looks from the perspective of other African Americans as well as whites.

double consciousness

Explanation:

Black people have lived in a time where they were the minority group and the were subordinated in a nation or in a place that was oppressive to them. Due to these issues people tend to become double conscious of who they are and where they are. It is an internal conflict that this group of people face. From this question we can see that Barry tends to see himself from the eyes and perspectives of other people.

it is the boston port act