Active military intervention
Answer:
The attack on the Lusitania brought the US closer to clan war in 1915 because Germany found a new way to attack, using a weapon called the U-boat, and they wanted to put an end to that. Early events in 1917 that cause President Wilson to declare war war events in Russia and the Zimmerman note.
The main reason Australia's economy collapsed right before the Great Depression began is because the government made poor decisions. Many factors led to their economy collapsing but they can be summed up by the government made poor decisions.
I hope that helps u out!
:)
