Answer:
According to the doctrine of separation of powers, the U.S. Constitution distributed the power of the federal government among these three branches, and built a system of checks and balances to ensure that no one branch could become too powerful.
Explanation:
Death camps and work camps I think
The first president was George Washington
There missiles ready and pointed at each country by the enemy state.
The movement of USSR missiles to Cuba caused an immediate reaction by the US. Negotiations worked back and forth to prevent a missile attack by either side. The US had missiles in Turkey which the USSR believed to be a threat to their safety.
The correct answer is B) No historians have written about the era that preceded the ancient era.
The option that could be a reason why humans know very little about the time before the ancient era is that no historians have written about the era that preceded the ancient era.
We are referring to what is cold prehistory, the time where events occurred before the existence of written records. Historians write what they can research or interpret written records from the past such as the clay tablets of Sumer-Mesopotamia or the Egyptians glyphs due to the Rosetta Stone. But without written records, all is speculation, that is why humans know so little about prehistory.
