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There was no Austria-Hungary after WWI it was broken up after the first world war
Joseph Ferdinand
No. That was World War 1
Austria Hungary did not become one nation after World War 1.
Bosnia wasn't an independent nation during the First World War, it was owned by Austria-Hungary at the time, the Emperor-King of Austria-Hungary was Franz-Joseph I until his death in 1916 and Charles I from 1916 until the dissolution of Austria-Hungary in 1918.
I believe you are asking what started World War I and that would be the assassination of the Austria-Hungary leader
Austria-Hungary
Austria-Hungary fought in the Battle of Ginghames during World War One. This battle was between Austria-Hungary and Italy.
germany
Austria-Hungary
If you're talking about Austria-Hungary and the one whose death started World War I, that would be Archduke Franz Ferdinand. During World War II, considering that it started in 1939, Austria was already a part of Nazi Germany, making Hitler the leader of Austria (and all other German countries excluding Switzerland and Liechtenstein). Not sure who was in charge of Hungary during this time...
It was a World War because a man killed the archduke of Austria-Hungary in Sebia. Austria-Hungary declared war on Serbia. Serbia had an alliance with Russia and then Russia joined the war. Russia was in the Triple Entante and pulled Britain and France into the war. Austria-Hungary had alliances with Germany and the Ottoman Empire. They also joined the war. That is why World War I was a world war.