What was the cause of austria Hungary to gain independence in ww1?

Austria-Hungary did not gain independence during World War I; rather, it was dissolved at the end of the war in 1918. The empire faced internal ethnic tensions and nationalistic movements, which were exacerbated by military defeats and the economic strain of the war. Following the defeat of the Central Powers, various ethnic groups within Austria-Hungary declared independence, leading to the formation of new nation-states such as Czechoslovakia, Hungary, and Yugoslavia. The Treaty of Saint-Germain in 1919 officially recognized the disintegration of the empire.