If there was something like that in a historical document, it would actually be really important. Although someone like Barak Obama does impactful things, not very many people are Barak Obama or have been president of the US. Most people have jobs involving manual labor or performing other unskilled tasks, so the life of someone who did similar things a long time ago is a lot more important to them than what it is like to be president.
Also consider that there were people maintaining roads 2000 years ago just as they are now and you see that all of these important people haven't changed things as much as you think.
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All right people, let's make a deal. No courses on LGBT (read : mentionning them ) but on the other side, no ''intelligent design'' and no textbooks claiming the civil war was about state rights.
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I struggle to envision a meaningfully unified curriculum if the subject keeps having sub-divisions tacked on.
Folly and fakery have always been with us... but it has never before been as dangerous as it is now, never in history have we been able to afford it less. - Isaac Asimov
Every damn thing you do in this life, you pay for. - Edith Piaf
The party told you to reject the evidence of your eyes and ears. It was their final, most essential command. - Orwell
No amount of belief makes something a fact. - James Randi
Except none of the things you listed, and especially nothing sexually oriented, should be taught to second graders. I'm all for states being able to make the dumbest mistakes they want for their state, as long as people have the ability to flee that state to one more rational, and I learned a lot of stupid crap in high school so that I doubt a section based around gay history wouldn't really be that bothersome, but the fact of the matter is teenagers don't even have fully developed brains nor do they have advanced critical thinking skills so how in the world could it be a good idea to introduce this to second graders. They don't even have a sexual identity with which they need to feel they aren't identify with properly.
I can understand putting LGBT rights in a history lesson but that should be in middle or highschool, shouldn't be in second grade