The examples and perspective in this article deal primarily with Anglosphere and do not represent a worldwide view of the subject. Please improve this article and discuss the issue on the talk page.(February 2011)
A map showing the unitary states of the world (in blue).
In a unitary state, subnational units are created and abolished and their powers may be broadened and narrowed, by the central government. Although political power in unitary states may be delegated through devolution to local government by statute, the central government remains supreme; it may abrogate the acts of devolved governments or curtail their powers.
Ukraine is another example of a unitary state (see Constitution of Ukraine). The Republic of Crimea within the country has a degree of autonomy and is governed by its Cabinet of Ministers and legislative Council. In the early 1990s the republic also had a presidential post which was terminated due to separatist tendencies that intended to transfer Crimea to Russia.
In federal states, by contrast, states or other subnational units share sovereignty with the central government, and the states constituting the federation have an existence and power functions that cannot be unilaterally changed by the central government. In some cases, it is the federal government that has only those powers expressly delegated to it.