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In politics, unitarisation is a process of uniting a political entity which consists of smaller regions, either by cancelling the regions completely or by transferring their power to the central government. Politics which favors this process is called unitarism. Opposite process is called regionalisation.
A unitary state usually has a unicameral legislature. Furthermore, the smaller regions within a unitary state do not have a contract (constitution) with the larger, more centralized government. Thus, the smaller regions government and powers are not "protected" by being entrenched in the constitution. Regionalisation and unitarisation are often confused with, respectively, decentralization and centralization.