Updated timelines

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Major Conflicts
Hero Timeline
Hero Timeline
Russian History: 20th Century Russia
Review
European Explorations of the East
Segment 2
Segment 2 timeline
U.S. Open
U.S. Open timeline
Hero Project
Hero Project timeline
20th Century Russia
20th Century Russia timeline
Christopher Reeve - Hero Project
Christopher Reeve - Hero Project timeline
American Revolution
American Revolution timeline
Historic timeline of the atom
The Progressive Era
Key Events during WWII
Key Events during WWII timeline
AP Lit - Restoration Period