Who did blackface hurt or harm? how do we know?

they harm the black people.Because they was stereotyping black people

The Black community.

Explanation:

Blackface is when a person of a lighter skin tone puts on black or brown paint on their face in order to make fun of a person of color. It began after the civil war, primarily used in plays by Caucasian actors playing black roles in an attempt to mock them.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.

independent innovation during the abbasid caliphate