British North America Acts
However, with Canada's agreement at the time, under the Statute of Westminster (sec. 7(1)) the British Parliament also retained the power to amend the key Canadian constitutional statutes, namely the British North America Acts. In effect, an act of the "British" Parliament was required to make certain changes to the Canadian constitution. Delay in the patriation of the Canadian constitution was due in large part to the lack of agreement concerning a method for amending the constitution that would be acceptable to all of the provinces, particularly Quebec.