I know exactly why they did that. They did it for political reasons. The left fabricated a horror story about Columbus and they had the lunacy to believe it over actual historical accounts. They dumped Columbus and gave that day to the native Americans.
My point is that in giving the indigenous people Columbus' day they short changed them by ONLY giving them a day.
However, I think the idea of giving certain groups a month is equally ridiculous. Instead of having an X History Month just emphasize the studying of history. If you want to learn about blacks, gays, women, Hispanics, red headed quadriplegics with an under bite, or whatever, then go get a book and read it. It doesn't matter what month it is.