Austria signed an independence treaty.
Austria . In 1955 , the Austrian State Treaty re-established Austria as a sovereign state , ending the occupation . Austria also signed the Schengen Agreement in 1995 , and adopted the euro currency in 1999 . The Austrian State Treaty ( German : ) or Austrian Independence Treaty re-established Austria as a sovereign state . The Treaty of Hubertusburg ( Frieden von Hubertusburg ) was signed on 15 February 1763 at Hubertusburg Castle by Prussia , Austria and Saxony .