Kingdom of Montenegro
On 28 November 1918, following the end of World War I, with the Montenegrin government still in exile, the Podgorica Assembly proclaimed unification with the Kingdom of Serbia, which itself was merged into the Kingdom of Serbs, Croats and Slovenes three days later, on 1 December 1918. This unification with Serbia would last, through various successor states, for almost 88 years, until finally coming to an end in 2006 as Serbia and Montenegro during the aftermath of the Yugoslav Wars .