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The BT tank, developed in the United States by J.W. Christie and produced in the Soviet Union, was known for its speed and advanced suspension system, allowing it to travel faster over rough terrain than previous tanks. These tanks, along with the Soviet T-26, were lightly armored and primarily armed with machine guns or smaller caliber guns, making them less suitable for direct infantry support. Their effectiveness was demonstrated during the Spanish Civil War.

The need for more heavily armed tanks became apparent, leading to the development of models like the German Pz. IV and the Soviet T-34, both equipped with more powerful guns. By the end of World War II, tanks had evolved significantly, with heavier models like the German Tiger and Soviet JS tanks featuring large-caliber guns designed to engage enemy tanks at long range. This era also saw the development of specialized vehicles like tank destroyers and assault guns.12

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