 Complete the following phrase:  Having been Spains closest colony to the United States until 1898, in the first part of the 20th century Cuba continued to develop with the influence of big investments, the creation of various industries, and growing travel to support mostly US interests and corporations. Its proximity roughly from the Florida Keys and close relationship to the United States also helped Cubas market economy prosper fairly quickly. As relations between Cuba and the United States deteriorated rapidly after the 