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You know, the trope. http://tvtropes.org/pmwiki/pmwiki.php/Main/MagnificentSevenSamurai should be the courtesy link. I mentioned this issue once in History Thread in YF but I'd enjoy still some more insight.
So, it just bugs me.
You know how "Seven Samurai" was the original and "Magnificent Seven" the remake. Pretty close remake, and here lies the problem. Picture this, a samurai flies into a rant on how the samurai make the peasants' life miserable, and the others realise he was born a peasant, and everyone's minds are blown. Understandable. And now, the same thing happens in "Magnificent Seven". But why, do I ask, are the other gunslingers so shocked to discover one of them is a peon? Who the hell were they, posh aristocrats? East Coast greenhorns? And nobody forbids a peon to buy a gun and have fun, too. Simply put, a twist based on class differences was shoehorned into a setting with no such class difference to speak of.
So this made me curious, which historical settings could let a plot copied from "Magnificent Seven" retain the class issue.