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. ABC 7 The United States will celebrate its 250th birthday on July 4, 2026 — marking 250 years since the adoption of the Declaration of Independence in 1776. But before students even walked through the doors, protesters gathered outside the campus holding signs reading, “No politics in school,” while some parents reportedly kept their children home over concerns about the conservative groups tied to the event, according to ABC7 Eyewitness News .…