Declarations of independence are typically made without the consent of the parent state, and hence are sometimes called unilateral declarations of independence (UDI), particularly by those who question the declarations' validity.
In many cases, independence is achieved without a declaration of independence but instead occurs by bilateral agreement. An example of this is the independence of many components of the British Empire, most parts of which achieved independence through negotiation with the United Kingdom government and legislation by the parliament of the United Kingdom. Australia and Canada, for example, achieved full independence through a series of acts of their respective national governments and parliaments and the British government and parliament.