Answer:
B. Atomic Weapons
Explanation:
Tanks were used near the end of WW1, with tanks such as the Renault FT, Mark 5, and the German A7Vs. Atomic weapons weren't even a concept back then. Gas was used since 1915, invented by a German scientist trying to develop a pesticide, and Machine guns such as the Vickers or MG08 were common in the trenches.
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During Jackson's time, the common white man was giving the right to vote. During reconstruction ( the period after the civil war ) voting could no longer be denied on race or color because of the 15 the amendment, but still only applied to men. Women got the right to vote with the 19th amendment in 1920.
