One federal unit (UF) is territorial and constitutional community that forms part of a federation.
You Brazilian states are units of federation. For example, Mato Grosso do Sul is a federation unit.
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It is important to emphasize that the federative units do not have the status of entities under international law. Rather, the federal union as a single entity is the sovereign state, which has the purposes of international law.
Depending on the constitutional structure of a particular federation, a federative unit may have varying degrees of legislative, judicial and administrative jurisdiction over a geographic territory defined. It is basically a form of regional government.
In some cases, a federation is created from a union of political entities, which are independent territories or dependent on another sovereign entity (most commonly a colonial power). In other cases, federative units are created outside the regions of previously unitary states.
Brazil has 27 federative units, made up of 26 states and a federal district. A The acronym used to name these units is UF.
When a person decides to make his General Registration (RG), he does not need to prepare the document in his home state. Taking this into account, the term UF of identity is used, which describes the Brazilian state in which a given individual requested the identity card.
The UF of birth of a person is the state in which a given individual was born and had his/her birth certificate registered. In Brazil we have 26 states and the Federal District, totaling the federative units of the nation.