When did the peace treaty between Croatia and Serbia go into effect?
Dayton Agreement
The General Framework Agreement for Peace in Bosnia and Herzegovina, also known as the Dayton Agreement, Dayton Accords, Paris Protocol or Dayton–Paris Agreement, (Bosnian: Dejtonski mirovni sporazum, Serbian: Dejtonski mirovni sporazum, Croatian: Daytonski sporazum) is the peace agreement reached at Wright-Patterson Air Force Base near Dayton, Ohio, United States, on 1 November 1995, and formally signed in Paris, France, on 14 December 1995. These accords put an end to the ​31⁄2-year-long Bosnian War, one of the Yugoslav Wars.
SAO Eastern Slavonia, Baranja and Western Syrmia
The entity was formed on June 25, 1991, the same day the Socialist Republic of Croatia decided to withdraw from Yugoslavia, following the Croatian independence referendum, 1991. In the first phase of the Croatian War of Independence, in 1992, the oblast joined the breakaway Republic of Serbian Krajina (RSK). After the fall of Republic of Serbian Krajina in 1995, there was a short-lived Serb parallel entity Eastern Slavonia, Baranja and Western Syrmia that existed in the same area and was reintegrated with the rest of country after the signing of Erdut Agreement and the end of the United Nations Transitional Administration for Eastern Slavonia, Baranja and Western Sirmium in 1998.