federalize
US /ˈfed.ɚ.əl.aɪz/
UK /ˈfed.ɚ.əl.aɪz/

1.
to unite (states, etc.) under a federal system of government
:
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The goal was to federalize the independent states into a single nation.
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They proposed to federalize the regional police forces.
2.
to bring (something) under the control of a federal government
:
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The government decided to federalize the healthcare system.
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There is a debate on whether to federalize the education standards.