Updated timelines

Paul Revere
Great Depression & WWII
Unity vs Diversity
Age of Exploration
Performance
Historia Adm.ambiental
WWII-Europe, Pacific, and Homefront
Cinema Admissions from 1935 - 2013 (millions)
medieval timeline
The World at War
To Kill a Mocking Bird 2
Scientific Revolution/ Enlightenment Era
Drone Warfare
HISTORIA DE LOS TICS
Byzantine Empire vs Rome
OPEC