1) You really need to get your self-inflated image of yourself, your locale and your ideology under control. Opposing the celebration of Columbus Day is not a "liberal" thing in and of itself. Period.
2) Oklahoma is FILLED with American Indians ... how on EARTH does this surprise you?
Look at a list of cities that have abolished Columbus Day previously. It's places like Berkley, Seattle, San Francisco, Denver, Minneapolis, liberal strongholds.
Correlation vs. causation. Conservatives (though split on the issue) tend to be more hawkish now, but in times past liberals (while also split) were more clearly more hawkish. I don't believe we should relabel being more hawkish as conservative or liberal every 20-30 years because one party saw it as more politically advantageous at the time; it's neither.
Same with this. Liberals exploited racial tension, ignoring civil rights for the first half of the 20th Century. Conservatives did the same in the latter half. It's hard to decide that one or the other is inherently conservative or liberal with that in mind, at least the way we use the terms now a days. I understand you'd probably rather live with a narrative that glorifies your other views along the way by always associating your ideology with what history has deemed the "right" thing, but I don't accept that revisionism.
