regardless of if wikipedia listed it or not, they fought in Gallipoli and helped the british. they held off the ottoman empire for a bit, they were definately allies. Same with new zealand. Look up ANZAC day, it explains there, but tbh i know that canada also briefly sent some troups down to the western front near the rear end of the war, might want to change and add those 3 countries at least.
Luxembourg never fought the German takeover; Albania never declared war and its peoples fought on both sides. Canada, Australia, South Africa, Newfoundland and New Zealand considered themselves independent Dominions yet considered themselves bound by the British DoW....