yea in my high school we actually had dedicated periods during history class where we could openly discuss or defend our own political opinions. although most of the class was liberal-leaning the few conservative students there would raise some pretty solid points and we would give shoutouts and compliments to a lot of them for expressing unpopular opinions. i'm sure if you go to school in the middle of bible-thumping nowhere or in a sanctuary city project you're going to catch some flak for any opinion that isn't popular to the region
this is off topic but i wish the american education system was more like ours and instead of having this piece of important education catered under 'history' it's instead under the social studies class every highschool student gets, so the actual history classes can remain focused on the rest of the world. my biggest irk with young american education is the absurd amount of self-centeredness around the history classes, while the rest of the world focuses on important history and only talks about america to explain who colombus was and what he did, and america's involvement in the world wars.
i have the fondest memories of history class learning about the history of north and south africa, mostly focused on egypt. as an entry lesson to the history class before going into the gritty stuff like world war 2. now i understand that history like the civil war is important to teach and exclusively an american topic, and i dont know how this is taught as im not american, but im assuming its a large portion and i think it would do the young students better if this subject was short and powerful like my own introduction to history class with Africa (this is relevant to my country because my country had the VOC, this is a topic that of course was also a short and powerful subject along with the history of Indonesia).
so what im basically saying here is that american history classes for highschoolers should be less saturated and have short but powerful lessons about american history but focus its big lessons and projects on world history like the world wars. oh and have its own class for social studies (learning about politics and how to debate)