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"So how do you include that in a textbook? "Horatio Blechmore not only founded the California Environmental Society, but he took it up the b*tt like a bad boy...."."
I wonder about this also. This is too hard for textbook writers to accomplish, even if they wanted to, because so many gays have been or are "in the closet". And to say somebody from the past such as Lincoln was gay; there's no way to ever prove or disprove this. They will just write books that say lots of historic people were gay to make us more accepting of gay, I guess.