Hundreds of Denver-area high school students have staged a walkout over an attempt to censor their history curriculum. A right-wing majority on the Jefferson County school board has pushed extensive changes to AP history courses to promote corporatism and deference to authority. Their proposed changes include the removal of all mentions of civil disobedience from textbooks and materials. The student walkout on Tuesday followed a similar action by teachers that shut down two high schools for a day last week.