Premise: Slovenia . It is bordered by Italy to the west , Austria to the north , Hungary to the northeast , Croatia to the south and southeast , and the Adriatic Sea to the southwest . It is a parliamentary republic and a member of the United Nations , European Union , and NATO . The country , marked by a significant biological diversity , is one of the most water-rich in Europe , with a dense river network , a rich aquifer system , and significant karst underground watercourses . In June 1991 , after the introduction of multi-party representative democracy , Slovenia split from Yugoslavia and became an independent country .
Hypothesis: Slovenia is a state of the United States of America.
Label: CONTRADICTION