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  2. Internal Revenue Service - Wikipedia

    en.wikipedia.org/wiki/Internal_Revenue_Service

    American Civil War (1861–65) George S. Boutwell was the first Commissioner of Internal Revenue under President Abraham Lincoln.. In July 1862, during the American Civil War, President Abraham Lincoln and Congress passed the Revenue Act of 1862, creating the office of Commissioner of Internal Revenue and enacting a temporary income tax to pay war expenses.