They are psychoactive drugs. This includes LSD, shrooms, DMT, etc.
A the answer is a because they speak different languages
I believe it is the Abolitionist Movement.
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The correct answer is B, "the domino theory". American president Dwight Eisenhower (1890-1969) coined the term in a 1954 speech where he explained the importance of Vietnam for "the free world".
He used the expression to argue that if South Vietnam became communist, this would generate a chain reaction and many near countries would also become communists. It was a classic Cold War idea: this war was fought in the manner of influencing zones.
Hidalgo dispatched a letter to the French governor of Louisiana