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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 24, 2020 · We began the 20th century with the infancy of airplanes, automobiles, and radio, when those inventions dazzled us with their novelty and wonder. We ended the 20th century with spaceships, computers, cell phones, and the wireless Internet all being technologies we can take for granted. 1900 The zeppelin invented by Count Ferdinand von Zeppelin.

    • Mary Bellis
    • Inventions Expert
  4. 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.

    • Jennifer Rosenberg
    • History Expert
  5. One of the most important inventions of the industrial Revolution, steam engines power the first trains, steamboats, and factories. 1794 Eli Whitney patents the cotton gin. Eli Whitney creates a machine that makes it much easier to separate cotton seeds from cotton fiber.