The division of the Roman Empire into eastern and western halves was a crucial step in the formation of the "Byzantine Empire", since this Empire "grew" in many ways from the former.
The answer of this question is three!
A) Bias
noun
prejudice in favor of or against one thing, person, or group compared with another, usually in a way considered to be unfair.
It was primarily the "b. formation of the Vietcong in Vietnam" that led the Truman administration to expand the containment doctrine to include Asia, since this was seen as a threat to democratic principles in the west as well.
