Benelux (Lowlands Combined)

The United kingdoms of the Benelux is a country comprised out of three kingdoms ( the Kingdom of Netherlands, the Kingdom of Belgium and the kingdom of Luxembourg) It has several overseas territories and has a commonwealth of previously colonized lands. Because of the many territories, it's one of the worlds superpowers and has been a huge influence on its neighbors.

United kingdom of the Netherlands
After the Dutch overthrew Napoleons rule, they made a deal woth the British that they would get back the southern provinces (Austrian Netherlands) so it would create a strong buffer zone, the British kept cape colony and Dutch Ceylon.

Belgium short independence
The huge differences that were made in the southern provinces when not under Dutch rule made their relationship harder. The Belgians fought for independence and gained it, but the Dutch didn't want to lose the land. The Dutch asked for unification but more in line of the UK and less like one whole country. The Belgians excepted under the line that Belgium would have it's own leader. The Dutch agreed.

Luxembourgian civil war
Luxembourg had