Number 1, The Treaty of Versailles, due to the fact it severely limited the German military, and made Germany pay large war reparations which destroyed the German economy.
Because it is different then all the other continents are defined
Gutenburg's printing press made books cheaper and available to a larger variety of people. Before the printing press, books were very hard to make and they took a long time to produce.
Aboriginal those people are savage
The Pax Romana happened under Augustus' rule.