Answer:
The Roanoke Colonies were an ambitious attempt by England's Sir Walter Raleigh to establish a permanent North American settlement with the purpose of harassing Spanish shipping, mining for gold and silver, discovering a passage to the Pacific Ocean, and Christianizing the Indians.
When he arrived at Roanoke Island in 1590 he found “CROATOAN” carved on a post and “cro” on a tree. He found no distress marks. They literally made a sign. It was expected the colonists would go with their friends, the Croatoans and tribe member, Manteo, Dawson
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If you mean supreme leader,Dictatorship does for example Kim jong un is a supreme leader and a dictator of North korea
The four river valley civilizations were the Tigris & Euphrates Valleys, the Nile River Valley, the Indus River Valley, and the Yellow River Valley. Civilizations developed around rivers because their waters provided places to hunt and fish. Also, as the rivers flooded, the lands around them became fertile.
Barack Obama was the 44th President of the United States.