圣文森特和格林那丁斯是俩个国家联合体吗？

两个岛国，名字上合成一个国家，体制未知。
Saint Vincent and the Grenadines

Britannica Concise Encyclopedia: Saint Vincent and the Grenadines

自己看 。。

Island country, Windward Islands, in the eastern Caribbean Sea. It is composed of Saint Vincent island and the northern Grenadines. Area: 150 sq mi (389 sq km). Pop. (2005 est.): 119,000. Capital: Kingstown. Most of the population is of African descent. Languages: English (official), French patois. Religions: Christianity (mostly Protestant; also other Christians, Roman Catholic); also Hinduism, Islam. Currency: Eastern Caribbean dollar. The islands are composed of volcanic rock. Thickly wooded volcanic mountains run north-south and are cut by many swift streams. Soufrière (4,048 ft [1,234 m]), the highest of the mountains, has had devastating volcanic eruptions. Agriculture is the mainstay of the economy, and export crops include bananas and arrowroot. Tourism is also important. The country is a constitutional monarchy