The Executive privilege is the privilege bestowed upon the president or a high executive officer to conceal confidential materials and information from the courts, Congress and public.
It is based on the belief that revealing such information may interfere with the ability to govern. Therefore, executive privilege is used to withhold information for the purpose of national security and public interest.
Thus, executive privilege describes the president's refusal to reveal confidential materials based of the belief that it could interfere with their ability to govern.
Many of the western civilization relied on the middle-east as the source of their oil import If a country is cut off by the middle-east, that country very likely to experience energy crisis
John Adams was the president when the Alien and Sedition Act was put into effect. The Act gave the different state's rights to deport or even imprison foreigners. The act also made it difficult for the immigrants to be given the right to vote.
We know this, because we have found traces of Neanderthal DNA in the human genome - interestingly, only in the Eurasian population. Estimates say that 1 to 4% of Eurasian genes are of Neanderthal origin.
Homo sapiens also interbred with Denisovan species.