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- Ongoing Book Banning
- Ongoing Playwrights
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- 1890 Airplanes (air flight)
- 1877 Bleeding Kansas
- 1862 The Civil War
- 1859 Combustion Engine
- 1845 Irish Potato
Famine
- 1844 Morse Code
- 1840 Western Frontier
- 1820's Calculators
- 1811 New Madrid Fault
- 1800's Computers
- 1792 Feminism
- 1790 French Revolution
- 1776 Common Sense
- 1665 Isaac Newton
- 1600's Blaise Pascal
- 1600's Galileo
- 1600 Slavery
- 1400's Math Symbols
- 1346 Bubonic Plague
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- 1170 Leonardo
Fibonacci
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- 1096 The Crusades
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- 1881 Vaccines
- 1869 Gandhi
- 1860 Baseball Migration
- 1849 The Gold Rush
- 1844 Telegraph Machine
- 1843 Oregon Trail
- 1837 Trail of Tears
- 1820 Charles Babbage
- 1803 Lewis and
Clark
- 1800 Libraries
- 1790 The Metric System
- 1783 Balloons (air flight)
- 1698 Steam Engine
- 1600's Longitude
and Latitude
- 1600's Johannes
Kepler
- 1600 Microscopes
- 1400's Nicholas
Copernicus
- 1400 Renaissance
Art
- 1400 Newspapers
- 1328 Jean Buridan
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