Hundreds of Denver-area high school students walked out their classrooms in a mass protest against what they call an attempt to censor their history curriculum by refocusing it on topics that promote citizenship, patriotism and obedience.

Students at six Denver-area highs schools walked out their classrooms en masse, protesting a plan by the conservative-majority Jefferson County school board to push for curriculum changes to Advanced Placement history courses to promote patriotism and deference to authority.