Virgin Islands Creole English, an English-based creole locally known as "dialect", is spoken in informal situations. The form of Virgin Islands Creole spoken on St. Croix, known as "Crucian", is slightly different from that spoken on St. Thomas and St. John. Because the U.S. Virgin Islands are home to thousands of immigrants from across the Caribbean, Spanish and various French creole languages are also widely spoken. Spanish is mostly spoken by Puerto Ricans; Puerto Rican migration was prevalent in the 1930s, 40s and 50s, when many Puerto Ricans relocated to Saint Croix for work after the collapse of the sugar industry. In addition, the U.S. Navy purchase of two-thirds of the nearby Puerto Rican island of Vieques during World War II resulted in the displacement of thousands of "Viequenses", many of whom relocated to Saint Croix because of its similar size and geography. Puerto Ricans in Saint Croix, most of whom have lived on the island for more than a generation, have kept their culture alive while integrating it into the native Crucian culture and society. For example, in informal situations, many Puerto Ricans in Saint Croix speak a unique Spanglish-like combination of Puerto Rican Spanish and the local Crucian dialect of creole English.