Timeline Unit 4 - Chapter 1 By clarkj23 Jun 11, 1901 Serbian King Alexander Obrenovic is assassinated (World Event) By the Black Hand nationalist movement Nov 22, 1902 First Australian Defence Act Mar 31, 1909 Serbia accepts Austrian control over Bosnia and Herzegovina (World Event) Dec 13, 1909 Second Australian Defence Act Jun 28, 1912 Archduke Franz Ferdinand is Assassinated (World Event) Triggered tensions between European powers Aug 5, 1914 Australia's declaration of support for Britain in the War