There is a large economic gap between Flanders and Wallonia. Wallonia was historically wealthy compared to Flanders, mostly due to its heavy industries, but the decline of the steel industry post-World War II led to the region's rapid decline, whereas Flanders rose swiftly. Since then, Flanders has been prosperous, among the wealthiest regions in Europe, whereas Wallonia has been languishing. As of 2007, the unemployment rate of Wallonia is over double that of Flanders. The divide has played a key part in the tensions between the Flemish and Walloons in addition to the already-existing language divide. Pro-independence movements have gained high popularity in Flanders as a consequence. The separatist New Flemish Alliance (N-VA) party, for instance, is the largest party in Belgium.