Political unitarism designates various theories, concepts or policies that advocate or enforce a fully unified and centralized system of government, with ultimate goal in creating a unitary state.
One of the most famous examples of local resistance to political unitarism in classical times was the internal conflict between ancient Athens and other federated city-states within the Delian League.
One of practical goals of political unitarism is to create a singular legislature, with exclusive legislative powers over the entire territory of a state.
Through the process of political unitarization, local regions within an emerging unitary state are deprived of any form of contract with the centralized government.
Thus, the remaining regional powers, if any have been left at all, are not protected by being entrenched in the constitution of the unitary state; they can be reduced even more, or completely abolished, by the acts of the central government.