Updated timelines

European Exploration
European Exploration timeline
Historia del padre rafael garcia herreros
1820s-1850s Important Events
Chapter 12 Events
Chapter 12 Events timeline
Chapter 27 Timeline
Evolucion de la Tecnología Educativa
Scientific Revolution
Scientific Revolution timeline
Chapter 27
World War II
Negotiations Timeline
Negotiations Timeline
13 colonies
The Scientific Revolution
Annotated Timeline for APUSH
1820's - 1850's
1820-1850_HB
1820-1850_HB timeline
Economic Transformations of the United States