With respect, I do not think there is any theory behind the country.
Domino Theory
scapegoat theory
damino theory
Einstein didn't prove the theory of relativity. It is a theory, a possible explanation, it is generally accepted because it explains a lot of things but that doesn't "prove" the theory, at least not to physicists. See related questions for the country of discovery.
Domino Theory
The Domino Theory.
It was known as the "Domino Theory".
Both ancient China and ancient Egypt followed divine right theory.
The theory that communists would spread from one country to neighboring countries is known as the "domino theory." This theory was particularly applied to the fear of communist expansion in Southeast Asia during the Cold War, with the belief that if one country fell to communism, others in the region would follow like a row of falling dominoes.
Domino theory.
(True) that is the theory of mercantilism.