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.
Explanation:
The internment camps where all over the US, but ,mostly to the west states. They were made to hold japanese americans, after the pearl harbor attack.
(very similar to concentration camps, but not meant to systematically kill Japanese people) hope this helped
