How was the American population changing at the turn of the century? What characterized it, and what key challenges does it pose?

Why did roosevelt support a europe first strategy even though it had been japan that had first attacked the us

The massacre at sand creek was an attack by a colorado militia on peaceful american indians. a colorado militia on a group of dakota warriors. american indians on peaceful white settlers. federal soldiers on a group of cheyenne warriors.

What is george calvert's american colony