A Southern California middle school assembly celebrating the upcoming US 250th birthday sparked furious backlash from left-wing parents and activists who accused organizers of bringing conservative politics into the classroom.

The event, dubbed “History Rocks 250,” was held this week at Canyon Hills Junior High School in Chino Hills and featured patriotic displays, student performances, and speeches focused on American history and civic pride.

A middle school assembly celebrating America’s upcoming 250th birthday sparked furious backlash from leftyparents.…