Bantu civilization was most affected by iron technology in weaponry, when they developed iron weapons around 400 AD which they used against hostile tribes to conquer them as they migrated allowing them a transition from being nomads to settlers.
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Significant changes enacted at the national levels included the imposition of an income tax with the Sixteenth Amendment, direct election of Senators with the Seventeenth Amendment, Prohibition with the Eighteenth Amendment, election reforms to stop corruption and fraud, and women's suffrage through the Nineteenth century
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