Updated timelines

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