The reason why vernacular literature eventually became the preferred way to produce books is because the "vernacular" was something that the majority of people could understand in terms of written language--meaning that a publisher and writer would make much more money printing in this language.
D: Communism. A major example would be the USSR and their "overnight industrialization" that took place in the 1920's-1930's
The Berlin Airlift caused tensions to increase due to American airplanes transporting goods to democratic and West Berlin while East Berlin was owned by communist USSR.
Andrew Jackson was known for his short temper and anger issues. He most likely had so many duels due to these problems