There are two others in the Caribbean (St Kitts-Nevis and St Vincent) and four in the Pacific (Niue, Nauru and the Cook and Marshall Islands), as well as Panama and Liechtenstein.
Persistent tensions over Anguilla's political status came to a head in 1967 when Britain created a self-governing entity which encompassed Anguilla and the islands of StKitts and Nevis to the south.