As Europeans made sailing vessels that enabled them to reach Canada and the now United States, no doubt Vikings preceding the French and Spanish and Portuguese and Italian explorers in reaching our shores.
How does that entitle them to 'claim' the land??
At least when Iraq invaded Kuwait, they claimed it had belonged to their people before, and perhaps had at some point.
We, however, had no such reason to take this land, and in the eyes of the world, were merely just conquerors without justification.
The Indian tribes living here at first were often hospitable to the white settlers, but when they were being crowded off their lands and denied hunting, etc., how could they be blamed for becomng hostile and aggressive?!!
If I brought thousands of friends and tried to take over your house and land in New York, would you meekly hand over the keys and move away?
I thought not!
It is said that the first scalpers were white men, and the Indians adopted it to show they would resist encroachment and our invasion.
All food for thought.....
And of course, any two different peoples/tribes war upon one another, just as it was in The Beginning with Cain and Abel.
Might alone does not make it "right," however.
We have what we have now, and cannot change things, but at least America does not desire any longer to conquer other lands per se.
(Think Spanish American War - contrived blowing up of ship justifies taking The Philippines, Puerto Rico, etc.?)
Were we to do so now would be to risk God's wrath, I believe.
We are engaged in conflicts now solely to give others a chance to live free rather than under dictators.