What did Nazis think about people who were
considered "non-Aryans"?

They thought that non-Aryans were inferior, specially Jews. They thought that only the strongest of the race will survive and others will perish. They thought that for Aryans, it was necessary to kill all non-Aryans. This concept was borrowed from the scientific theory that says something like this about species of animals. It is important to note that the theory never mentions "human races". They misunderstood the theory (or acted like they misunderstood the theory). They thought that Aryans were the best "race".

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.

the main concern with the first draft of the articles of confederation was too much power in the state governments.