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PHILADELPHIA (CBS) — The principal of Cherry Hill High School East has issued an apology after some words on the school’s senior prom tickets drew criticism.

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The tickets told students to “party like it’s 1776,” because the dance is being held at the National Constitution Center.

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“It was insensitive and irresponsible not to appreciate that not all communities can celebrate what life was like in 1776. I especially apologize to our African American students, whom I have let down by not initially recognizing the inappropriateness of this wording,” principal Dennis Perry explained in a letter to the community.

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Students who attend the prom will receive commemorative tickets with a new design.