Read this: Appointments to the Order of the British Empire were at first made on the nomination of the self-governing Dominions of the Empire, the Viceroy of India, and the colonial governors, as well as on nominations from within the United Kingdom. As the Empire evolved into the Commonwealth, nominations continued to come from the Commonwealth realms, in which the monarch remained head of state. These overseas nominations have been discontinued in realms that have established their own Orders—such as the Order of Australia, the Order of Canada, and the New Zealand Order of Merit—but members of the Order are still appointed in the British Overseas Territories.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): Why did the oversea nominations discontinue?
established their own Orders