What did people believe was possible in
the U. S.?

For decades archaeologists thought the first Americans were the Clovis people, who were said to have reached the New World some 13,000 years ago from northern Asia. But fresh archaeological finds have established that humans reached the Americas thousands of years before that. These discoveries, along with insights from genetics and geology, have prompted reconsideration of where these pioneers came from, when they arrived and what route they took into the New World.

Explanation:

they sometimes resort to unethical tactics.

can you post options so i can ?