Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Republic of Serbia was a federal unit of the Socialist Federal Republic of Yugoslavia from 1990 to 1992, the Federal Republic of Yugoslavia from 1992 to 2003 and the state union of Serbia and Montenegro between 2003 and 2006. With Montenegro''s secession from the union with Serbia in 2006, both respective states became sovereign in their own right. The Socialist Republic of Serbia was dissolved in 1990 after the League of Communists of Yugoslavia collapsed. A new constitution was created, in which Serbia which would be a constituent republic with democratic institutions within Yugoslavia.