Combatants 

Why are "nations" such as Canada, Australia, Newfoundland etc. etc. listed as combatants as nations in their own right? All of those "countries" were still part of the British Empire at the time of the Battle, so why are they all listed as if they are independent nations? Shouldn't it be part of somekind of list, such as:

British Empire
 *Newfoundland
 *Canada
 *Australia

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