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er, the combatants had developed a range of different types of aircraft, including bombers and fighters that were able to fly higher, farther, and faster than any aircraft that had existed at the start of the conflict. The first tanks were also introduced in World War I, and although these machines were slow and cumbersome at first, they went on to change the tactics and structure of modern warfare. Both tanks and aircraft advanced quickly and were built in huge numbers in the period between the two wars, eventually equipping the forces that fought in World War II

B-25 bombers are assembled at the North American Aviation facility in Kansas City, 1942.

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Understanding the Arms Trade