In a January 10 telephone interview, school administrator Jim Van Dellen said the homework was an "unintentionally, poorly worded assignment" and school administrators are "in active conversations with parents".
The assignment was handed out to the children at Our Redeemer Lutheran School in Wauwatosa, Wisconsin.
"We understand that, as presented, the words used showed a lack of sensitivity and were offensive", Van Dellen wrote.
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"You wouldn't ask someone to list three good reasons for rape or three good reasons for the Holocaust", Brown-Berry told the AP.
Dellen has also reportedly sent a letter to the parents and the students, saying: "The goal of the assignment was not, in any way, to have students argue that any slavery is acceptable".
According to a report in the NBC-affiliated television station WKYC-TV, the freakish assignment was first noticed by Trameka Brown-Berry, the mother of Jerome Berry, a fourth-grader studying at the school.
Brown-Berry's son wrote on his assignment, "I feel there is not good reason for slavery".
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One of the parents, Trameka Brown-Berry, uploaded a photo of her son Jerome's home assignment to her Facebook page, asking if anyone else found her fourth-grader's homework offensive.
Brown-Berry says the assignment should be a lesson to us all. The 9-year-old also finished the assignment by saying, "I am proud to be black because we are strong and fearless".
Brown-Berry's son, Jerome, refused to list "good" reasons. "The bigotry and anti-diversity feelings in this country lead people to believe it's OK to act like that", Goodson said, USA Today reported.
In a statement to ABC News affiliate WISN News, the school's principal, Jim Van Dellen, said an apology letter was sent to parents, and the teacher did not explain the assignment correctly. "Speak up. Tell your story", she told Fox 6.
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She also said the teachers must be trained in "cultural diversity/cultural competency inservice to prevent this from happening again". It's unclear what the teacher meant by the quotation marks.