I'd agree that the background is different, but as far as raising awareness go, it was much more effective.
It's not really the movie the itself, it's the mythology it was based upon, a particular mythology most of us westerners have a difficult time letting go of - a culturally, morally, scientifically superior smaller band of westerners, led by a genius confronting and winning against countless eastern hordes.
We have a habit of remembering the nice things and forgetting the ugly. Not in any way unique to Columbus.
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