Answer:
ok i think it is because you are are cheating
Explanation:
the Legislative branch (specifically the Senate) must ratify treaties. This check on the power of President is part of the system of checks and balances.
Mercantilism is really the idea that trade generates wealth, so i would have to say 3. establishment of subsistence agriculture
ANSWER: Indus Valley
Many historians believe the Indus civilization collapsed because of changes to the geography, climate of the area, halted trade with Mesopotamia, and Aryan invasions.