Existed: 26 June
1816 - 28 June 1919
only settlement was Kelmis
Incorporated into Belgium
The Vienna Congress of 1814 - 1815 redrew the borders
of Europe. However, it could not reach an
agreement on the
demarcation of the border between Prussia and the Netherlands.
This was due to a zinc mine that was claimed by both nations.
On 26th June 1816 the Aachen Border Treaty stated that the
disputed area (Mairie Moresnet) would be divided three ways: part going
to the Netherlands, part to Prussia, and part becoming Neutral Moresnet
under joint Prussian and Dutch administration.
Neutral Moresnet was only 3.5 km².
In 1830 Belgium became independent of the Netherlands and
replaced the Dutch part of Neutral Moresnet's administration.
In 1915 Belgium was occupied by Germany. Neutral
Moresnet was therefore governed by Germany only.
On 18th June 1919 the Treaty of Versailles incorporated
Neutral Moresnet into Belgium.