During the 19th century, Cleveland's location at the mouth of the Cuyahoga River and Great Lakes port helped make it an important industrial center of the central United States. During World War II, the city became a center of manufacturing and industry, but deindustrialization caused a decline after that. Cleveland had a major revival in the 1980s and 1990s: The Playhouse Square theaters were restored, new skyscrapers like the BP Building and the Key Tower were built, new stadiums were built, and the Rock and Roll Hall of Fame was opened on the lakefront. After a smaller decline in the 2000s, Cleveland has begun to make another comeback. 