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  2. Jan 13, 2022 · AP World History: Modern Period 4 Notes (1900-Present) Key Takeaways — AP World History Modern Period 4 (1900-Present) Military conflicts are central to understanding the course of the twentieth century and the current system of states and international organizations.

  3. Jan 13, 2022 · AP World History: Modern Period 3 Notes (1750-1900) Key Takeaways — AP World History Modern Period 3 (1750-1900) The ideals of the Enlightenment inspired a wave of independence movements and revolutions throughout the Americas and Europe that promoted liberty and other democratic values.

  4. Alfred Noble invents dynamite, which is a safer way to blast holes in mountains or the ground than simply lighting black powder. Dynamite is important in clearing paths to build things such as roads and railroad tracks. January 1870 Louis Pasteur develops vaccines for diseases. A chemist named Louis Pasteur believed that germs caused disease.

  5. Jul 21, 2009 · February 5: U.S. chemist Leo Baekeland (1863–1944) presents his invention, the first synthetic plastic known as Bakelite, to the American Chemical Society. February 12: The NAACP is founded by a group including W.E.B. Du Bois , Mary White Ovington, and Moorfield Storey.

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  6. the creation of a large class of landless farm laborers, wealthy landowners taking over communal lands, European population growth as a result of new crops such as potatoes and corn, the introduction of better livestock, soil improvement, and crop rotation.