Edited sentence: He insisted in utilizing blacks for clearing the forest and building the railroad tracks.Henry Meiggs Keith, an American hired by the Costa Rican government, was in charge of this buiding the railroad to the Atlantic.In 1872 the first group of Jamaicans entered the country.The two large Jamaican migrations occurred at the time of the railroad construction and in the next century, for the banana plantations owned by the United Standard Fruit Company.These Jamaicans and their descendants would become the main inhabitants of the region, thus providing the basis for a culture that was entirely different from any other in the country