Actually Native Americans had settled down for many years long before Europe wandered on into it. In fact, the Vikings would have had more of a claim to North America than Europe.

By the way, you're pretty much saying the ends justify the means(Japan bombing), as well as that surprise attacks should not be allowed(even when we knew it was going to happen).

The ends NEVER justify the means, no matter what. To say that they do is to give moral ground to that which you should never give, which is what you so constantly despise and hate.