Netherlands
When the Kingdom was formed in 1954, the territories in the Caribbean became part of the Netherlands Antilles. At that time it also included Suriname in South America, which became an independent country in 1975. Aruba left the Antilles in 1986, and Curaçao and Sint Maarten did the same in 2010. The rest of the islands then became the Caribbean Netherlands which is part of the Netherlands proper.