By equipping Australia's military with British warships and small arms.
Yes. As a member of the British Commonwealth of Nations, Australia was bound to join the war when Britain did and on Britain's side.
Britain
no
Protect Australia from Japanese attacks and an invasion.
Yes
Australia was originally ruled by Britain so that one is easy. Britain and US are on friendly terms, so that probably adds to why we have good terms with Australia. While Australia is now formally independent of Britain, Britain has always been close to Australia because it is the mother country and established the nation in the 1700s. The US as a world superpower is necessary to maintain as a friend because of the position it takes on the world stage in economic and defence terms.
Because of the (British Empire). Britain used to rule Australia along with more of the world than anyother country,hence why theres such strong ties to Great Britain all over the world.
Reasons for Australia's InvolvementAustralia was a colony of Great Britain.
Because Australia was still technically part of the British Empire ( a Dominion) and was bound by an alliance that required it to participate in wars which involved its "sovereign" country( in this case Britain).
In most cases in Britain there was no way to protect homes.
Australia followed the lead of Britain. Prime Minister Menzies announced lamely 'Because Great Britain is at war with Germany, Australia also is at war'.