Answer:
1. The Enlightenment
2. The Napoleonic Wars
3. The Congress of Vienna
4. German Unification
Explanation:
The enlightenment: started either 1701 or 1650
German unification: 1871
The Congress of Vienna: November 1814 to June 1815
The Napoleonic Wars: 1803 - November 20, 1815
Because the Napoleonic wars were just wrapping up when the Congress of Vienna started, i would place it ahead.
