Which system has a central government and local units that implement the central government's decisions? OA monarchical system
OB parliamentary system
OC unitary system
OD federal system
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The american civil war

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Jackson  said nullification 'means insurrection and war,' and called it a treasonous attack on america. the second aspect of the  force bill  was the passing in congress of a lower tariff in 1833. this was offered as a compromise to avoid conflict with south carolina, and to attempt to defuse the tense situation.source google