The printing press allowed information to be spread much quicker and reach farther.
Unity was brought mainly by the decades-long process of setting up and expanding the European Union in the aftermath of WW 2; also the disappearance of the Iron Curtain in 1989 was a major factor in uniting Europe.
Major disruptive factors were of course the two World Wars, and before 1989, the existence of a Communist-dominated Eastern Europe versus Western Europe.
Answer:
Good job, but I really wanted to see it. Even if John told me no.
Explanation:
And I slap the hardest but out of the pictures, probably the nun
Papermaking, printing, gunpowder and the compass - the four great inventions of ancient China-are significant contributions of the Chinese nation to world civilization.