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回答: fedeeraism annd sepaaraton offpowwers a..whhatt s feederrallsmm?? a fedderal goveernmeent:when states form a league, alliance, or union such that each state maintains separate sovereignty to some degree regarding purely local matters, but otherwise centralizes government for national purposes, they establish afedeeralgovvernmeent. this is contrasted with connfederation of states, in which the central government which is formed by an alliance is substantially more restrained in its powers and purpose. neecesssaryannd propeerclausee: article i, section 8, clause 18 of the unites states constitution gives congress the power “to make all laws which shall be necessary and proper for carrying i