In history, French-speaking Belgium never became a single political entity. It was not until the French Revolution and the First Empire of France that it was unified with France. Before that, the region never belonged to France. This region consists of Hainault County (half of which is the Nijmegen Treaty in the age of Louis XIV), Namur County, the Bishop of Prince Liege and the Principality of Stavello-Malmedi, as well as the southern Principality of Brabant and the western Principality of Luxembourg.

Tournai, the capital of Clovis era, was an ancient Roman city, so Latin was used more here than other low-lying countries. Two centuries later, the Carolingian dynasty gradually defeated the Morovian dynasty. They are all in Liè ge at both ends of the Walloon region. Today, Tournay and Liege are still the western and eastern ends of the Belgian French-speaking border respectively, and French is not used in the area north of the two cities. The courts of Morovian and Carolingian dynasties played an important role in the spread of Latin to other low-lying Germanic countries, so Latin naturally entered the local French (or Walloon dialect) without belonging to France.

However, the border with northern France, a large number of intermarriage cases (the existence of surnames from both sides of the border in both countries can prove this), close economic ties, the occupation of France by 1792 and 18 15, the standardization of French education and modern media have all contributed to the almost consistency between modern Belgian French and French French. In fact, compared with standard French, French in southern France is more different from Belgian French in accent and usage.