Montenegro celebrates its Independence Day annually on May 21st, in commemoration of the day in 2006 when the majority (55.5%) of the citizens of Montenegro, voted to restore sovereignty and peacefully separate from the State Union with Serbia. Montenegro's parliament followed, by declaring the Republic's independence, on June 3, 2006.
The vote and the Parliament declaration, ended 88 years of union with Serbia. Montenegro officially became the 192nd member of the United Nations on June 28, 2006.