Whether New Zealand is independent has very much to do how the nature of 'political independance' is interperated. Like most words in the English language independence can be applied in many ways all of which allude to a general theme. You state that we are not independent. That is correct in as much that we are subject to numerous international treaties and convention but wrong when these treaties and convention have been entered into willingly and by our choosing. I have p-osted a link on the Westminster System of which the New Zealand Parliment operates under. While it is true that an upper house is part of the West. System it is not a prerequisite.
http://www.fact-index.com/w/we/westminster_system.html
I think this is waht you are talking about. Not too sure of the reason for the change from a Dominion to a Realm but at a guess it would formalise some measure of responsibility over the said islands and the Ross Dependency. This is a guess on my part. There has been no change in the role of the Queens Representitive concerning legislation: as far as I know.
The New Zealand Letters Patent and associated Prerogative Instruments which describe the Realm of New Zealand and constitute the office of the Governor-General of New Zealand, state the following:
Her Majesty the Queen of New Zealand does hereby constitute, order and declare that there should be, in and over the Realm of New Zealand including the Cook Islands, Niue, Tokelau and the Ross Dependency, a Governor-General and Commander-in-Chief who shall be our representative in Our said Realm of New Zealand, and shall have and may exercise the powers and authorities conferred on him by these Our Letters Patent .."
This link gives a brief outline of our Constitution.
http://www.gg.govt.nz/role/constofnz.htm
I am of the opinion that the Republican sentiment that now appears to be gathering momentum has more to do with the belief that if New Zealand goes down the Republican road then the Treaty of Waitangi and its issues will be swept away. This will not happen. I could write volums on this but when you consider that our system has survived since the days of King John and the Magna Carta and the political evolution has taken place from then till now in reguards to the Westminster system along with all of its variations, I do not believe that any republican model will survive the length of time that our current system has.
Skyryder
http://www.gg.govt.nz/role/constofnz.htm
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