Another moral dilemma question

"If you could prevent the genocide and subjugation of Native Americans and possibly prevent the Trans-Atlantic Slave Trade from ever beginning by sinking Columbus's expedition to the New World, would you?"

I was thinking along the lines of the killing Hitler scenario. This question presents many of the same elements, killing a few to save many. But it also presents an moral angle directly relating to modern America that the Hitler question lacks by being more applicable to modern Europe. It seems logical that anyone willing to kill Hitler would be willing to sink Columbus, but because that would change the entire history of the U.S., I don't know that people would answer the same way.

Even though I thought of it, I don't like the question for many of the same reasons I listed for not liking the Hitler question on my previous post. But I am curious as to what people think about it.