The islands had a largely seafaring culture; natives were familiar with the area from turtle fishing and other activities. Former slaveholders from the Cayman Islands were among the first to settle in the seaside locations throughout primarily western Roatán. During the late 1830s and 1840s, former slaves also migrated from the Cayman Islands, in larger number than planters. All together, the former Cayman peoples became the largest cultural group on the island. For a brief period in the 1850s, Britain declared the Bay Islands its colony. Within a decade, the Crown ceded the territory formally back to Honduras. British colonists were sent to compete for control. They asked American William Walker, a freebooter (filibuster) with a private army, to help end the crisis in 1860 by invading Honduras; he was captured upon landing in Trujillo and executed there. In the 20th century, there was continued population growth resulting in increased economic changes and environmental challenges. A population boom began with an influx of Spanish-speaking Mestizo migrants from the Honduran mainland. Since the late 20th century, they tripled the previous resident population. Mestizo migrants settled primarily in the urban areas of Coxen Hole and Barrio Los Fuertes (near French Harbour). Even the mainlander influx was dwarfed in number and economic effects by the overwhelming tourist presence in the 21st century. Numerous American, Canadian, British, New Zealander, Australian and South African settlers and entrepreneurs engaged chiefly in the fishing industry, and later, provided the foundation for attracting the tourist trade. In 1998, Roatán suffered some damage from Hurricane Mitch, temporarily paralysing most commercial activity. The storm also broke up the popular dive-wrecks "Aguila" and "Odyssey." The English-speaking people who have been established in Northern Honduras (specifically, the Bay Islands) since the early 19th century are chiefly of European and British-Afro-Caribbean descent and are called Garifuna or Afro-Caribbeans. They are called "caracoles" by Spanish-Speaking Hondurans, a term deemed offensive by native Islanders who have a long-standing rivalry with Spanish-speaking Hondurans because of their differences in culture, language, beliefs and ideals. All native islanders prefer the term "Islanders" when being referred to. The region of the Bay Islands encompasses the three major islands of Roatán, Útila and Guanaja, the Hog Islands as well as the smaller islands or cays.