federalism
US /ˈfed.ɚ.əl.ɪ.zəm/
UK /ˈfed.ɚ.əl.ɪ.zəm/

1.
a system of government in which power is divided between a central authority and constituent political units
:
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The country adopted federalism to balance regional autonomy with national unity.
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The debate over federalism is central to the country's political structure.