What became of the empire of Austria-Hungary after World War I?

After World War 1, Austria-Hungary was broken into pieces, roughly along ethnic lines. Austria, Hungary, Czechoslovakia all became independent states. Land was given to Romania (Transylvania, the Banat and most of Bukovina) and Italy. The Austrian Province of Galicia was combined with the former German-Polish lands, and the Russian-Polish lands taken by Germany at the Treaty of Brest-Litovsk, to reestablish the republic of Poland. Dalmatia and Croatia and Slovenia all merged with the formerly independent Bosnia to create Yugoslavia.
At the end of World War 1, the Austrian-Hungarian Empire had collapsed into ethnic violence following the death of Emperor Franz Joseph.