Following the 1959 Cuban revolution that unseated Batista and brought Fidel Castro to power, most Cubans who were living in Miami returned to Cuba. Soon after, however, many middle class and upper class Cubans moved to Florida "en masse" with few possessions. Some Miamians were upset about this, especially the African Americans, who believed that the Cuban workers were taking their jobs. In addition, the school systems struggled to educate the thousands of Spanish-speaking Cuban children. Many Miamians, fearing that the Cold War would become World War III, left the city, while others started building bomb shelters and stocking up on food and bottled water. Many of Miami's Cuban refugees realized for the first time that it would be a long time before they would get back to Cuba. In 1965 alone, 100,000 Cubans packed into the twice daily "freedom flights" from Havana to Miami. Most of the exiles settled into the Riverside neighborhood, which began to take on the new name of "Little Havana". This area emerged as a predominantly Spanish-speaking community, and Spanish speakers elsewhere in the city could conduct most of their daily business in their native tongue. By the end of the 1960s, more than four hundred thousand Cuban refugees were living in Dade County.