ARVADA, Colo. — Hundreds of students walked out of classrooms around suburban Denver on Tuesday in protest over a conservative-led school board proposal to focus history education on topics that promote citizenship, patriotism and respect for authority, in a show of civil disobedience that the new standards would aim to downplay.

The youth protest involving six high schools in the state’s second-largest school district follows a sick-out from teachers that shut down two high schools in the politically and economically diverse area that has become a key political battleground.

Student participants said their demonstration was organized by word of mouth and social media. Many waved American flags and carried signs, including messages that read “There is nothing more patriotic than protest.”

“I don’t think my education should be censored. We should be able to know what happened in our past,” said Tori Leu, a 17-year-old student who protested.

The school board proposal that triggered the walkouts in Jefferson County calls for instructional materials that present positive aspects of the nation and its heritage. It would establish a committee to regularly review texts and course plans, starting with Advanced Placement history, to make sure materials “promote citizenship, patriotism, essentials and benefits of the free-market system, respect for authority and respect for individual rights” and don’t “encourage or condone civil disorder, social strife or disregard of the law.”

The proposal from Julie Williams, part of the board’s conservative majority, has not been voted on and was put on hold last week. She didn’t return a call from The Associated Press seeking comment Tuesday, but previously told Chalkbeat Colorado, a school news website, that she recognizes there are negative events that are part of U.S. history that need to be taught.

“There are things we may not be proud of as Americans,” she said. “But we shouldn’t be encouraging our kids to think that America is a bad place.”