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Japan decided to model its Central Government after the United States of America.
A central government is only an office; the states are the nation.
Constitutional monarchy
Constitutional monarchy
Constitutional monarchy
Constitutional monarchy
federal
Federal
I am assuming by level, you mean level of government. There is no distinction between government on a national level and government on a federal level. The federal level of government is the highest tier of government because its central to the nation. It represents a union of states. Those union of states form a nation. So you see how the two terms are interchangable, and can be used synonymously. The federal government is government on a NATIONAL level.
Self-determination
federal
The secession of the Southern states contributed the most toward the realization that the nation needed a stronger central government . Prior to this the states simply had a cooperative agreement.