Answer: The Invention of the timer gear on fighter aircraft, the monoplane and more advanced aircraft such as fighter and bombers. the tank, the submarine, the machine gun, the dreadnought, the semi-auto rifle, chemical weapons, and the sub-machine gun. The tank, the submarine, the machine gun, semi-auto rifle, and the sub-machine gun are all still used today.
Walter white, Langston Hughes, Claude McKay, and James Weldon Johnson were all famous 1920 African American representatives of a prominent literary movement of the 1920s - Harlem Rennaissance.
