After the war ended, the American population boomed and energy demands soared. In the 1970s, after years of economic downturn, Boston boomed again. After World War II, Golden boomed, rapidly gaining population, size and economy. Her popularity boomed in the 1970s after her success in Japan. The retail market boomed in the 1980s. After Poland regained independence in 1918, Polish tourism boomed, and was encouraged by the government. The area boomed in the 1980s as a leading tourist destination. After the war, the coal industry boomed. In the 1920s, the economy of Puerto Rico boomed. The Biloxi economy boomed as a result, attracting new residents and businesses. In Africa, since the beginning of the 1990s, the development of middle-class suburbs boomed. Immediately after the occupation, from 1967 to 1974, the economy boomed. Bodie boomed from late 1877 through mid to late 1880. The town and its environs boomed economically after the war. However, the internal slave market still boomed after 1820 despite British efforts.