Water could be considered a resource, a mineral, an expensive and vital enterprise to life and various other purposes, also might have catalysed the formation of life on earth.
Water is a vital source for many functions such as the earth's temperature, humidity, biogeochemical cycles and other roles.
President Dwight D. Eisenhower was the first president to explain the domino theory, although he never actually called it the domino theory. He was explaining it in regards communism in Southeast Asia.
C. Separation of powers although I guess it also ties in with checks and balances and the branches of the government
