In 1931 , the Statute of Westminster ended the power of the British Parliament to legislate for dominions such as South Africa .
In 1931 , the Statute of Westminster gave those dominions the power to repeal or amend British laws in force within their territories .
In 1931 , the Statute of Westminster ended the power of the British Parliament to legislate for dominions such as South Africa and gave those dominions the power to repeal or amend British laws in force within their territories .