These figures correspond to the figures of the book (translated in French) of a Flemish journalist . Both authors agree that this phenomenon was very important in the nation building or in any case of the identity building of the two greatest Belgian population, the
Walloons and the Flemings. Among the industrial areas along the
Sillon industriel, the
Borinage (in the West of Wallonia) and the region of
Verviers (in the East) are less concerned by the phenomenon. The most important area of the Flemish immigration are three basins of the industrial
Wallonia:
Charleroi,
Liège and the
Centre around
La Louvière. In the period of the census published by Quairiaux, almost 500,000 Flemings came in Wallonia to find a job in the industry. The Belgian census calculate the number of Belgians who speak French, Flemish (now Dutch), and German. Quairiaux estimates the number of the Flemings in Wallonia on the basis that in Wallonia in this period only the Flemings were Flemish-speaking or bilingual (Flemish-French). They quickly adopted the regional culture and the regional language (more
Walloon or
Picard than French in any case in the beginning). == Reception of the Flemings by the Walloons ==