In Australia, WW1 is much more important that WW2. We base one of our most important holidays -ANZAC Day- Soley on what happened during WW1. Only recently has WW2 become more prevalent thoughout our ceremonys.
In addition, WW1 shaped, and still is shaping, Australian society. Without WW1, Australia would be a much different place- we might have closer ties to britan, for example. World War 2 simply doesnt have that effect- and while there are major battles Australia participated in- In particular the pacific theatre and the middle east- Gallipoli and the Western Front are often haled as Australias "True Birth", in which Australia, who was only recently federated at this point, finaly took up a National Image- that of the Digger. World war two had a more immediate and far reaching effect- for example, it introduced American culture to Australia- World War one came first, and for that simple reason, had a larger effect.
WW1 in australia is actiualy more prevalent than WW2- Especialy when it comes to Australia.
In WW2, the battles were all American- Every battle Australians were in were either aided by Americans or British Empire forces, except for (Comparativley) small battles Such as the raids on Darwin, Or the (Comparativley- To the Americans that is) Uninteresting battles Such as Kokoda, Tobruk, Greece and Singapore, not to mention the many skirmishes that took place in the pacific without American aid.
WW1 had major Australian-Fought conflicts though, Such as defence of the middle east and The Dardanelles Campaign, in which Australia first truly actiualy did something that united the country.
For Australia, the first time every single state and territory united was World War one. The second time was World War two.
For Americans, theyre history streches hundreds of years, from Revolutions to Civil Wars. For the English (And UK in general) Theyve had thousands of years of history.
Australia had about 150. Not to forget that Australia had been a commonwealth for about 13 years.
For these reasons, World War one takes a more prevalent role in Australian society than any other major conflict, as it not only United and newly-Formed country, but it also gave Australia its national image, a seat in international affairs, and its first major step in History since Federation.