The personal income tax did not become permanent in the United States until the First World War; before that time the federal government was dependent on tariffs to be their main source of revenue.
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Athe federal government was dependent on tariffs to be their main source of revenue
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Bthe federal government had depended on tariffs as its main source of revenue
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Ctariffs were what the federal government was dependent on to be its main source of revenue
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Dthe main source of revenue for the federal government was dependent on tariffs
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Efor their main source of revenue, tariffs were depended on by the federal government
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