In 1793, France annexed the enclaves of Manderen, Momerstroff, and the County of Kriechingen – all possessions of princes of the Duchy of Luxemburg – a state of the Holy Roman Empire, and incorporated them into the Moselle department.

As a result, France ceded the exclave of Tholey (now in Saarland, Germany) as well as a few communes near Sierck-les-Bains (both territories until then part of the Moselle department) to Austria.

On the other hand, the Treaty confirmed the French annexations of 1793, and furthermore, the south of the Napoleonic department of Sarre was ceded to France, including the town of Lebach, the city of Saarbrücken, and the rich coal basin nearby.

However, with the return of Napoleon (March 1815) and his final defeat at the Battle of Waterloo (June 1815), the Treaty of Paris in November 1815 imposed much harsher conditions on France.

It was slightly smaller than at its creation in 1790, the incorporation of the Austrian enclaves not compensating for the loss of Saarlouis, Rehlingen, Tholey, and the communes around Sierck-les-Bains.

Adolf Hitler considered Moselle and Alsace parts of Germany, and as a result the inhabitants were drafted into the German Wehrmacht.

[5] The United States Army liberated Moselle from Nazi Germany in the Battle of Metz in September 1944, although combat continued in the northeastern part of the department until March 1945.

In recent years there has been a revival of the old dialects and distinct Franco-German culture of the region with the onset of open borders between France and Germany as members of the European Union's Schengen Treaty.

Moselle is part of the current region of Grand Est and is surrounded by the French departments of Meurthe-et-Moselle and Bas-Rhin, as well as Germany (states of Saarland and Rhineland-Palatinate) and Luxembourg in the north.

The environment has undergone heavy industrialization linked to iron deposits in Lorraine, which have artificialized valleys and river banks.

The site helps local businesses to create pages showcasing their services, boosting their visibility and potential activity.

The population has remained relatively stable since World War II and now exceeds 1 million, located mostly in the urban area around Metz and along the river Moselle.

Four sites in Moselle were included in the Atlas Linguarum Europae, to investigate the Germanic dialects used in these areas: Arzviller, Guessling, Petit-Réderching and Rodemack.

Local resistance to a total acceptance of French law arose because some of Bismarck's reforms included strong protections for civil and social rights.

After much discussion and uncertainty, Paris accepted in 1924 that pre-existing German law would apply in certain fields, notably hunting, economic life, local government relationships, health insurance, and social rights.

Over the past twenty years the Conseil départemental de la Moselle has encouraged the development of tourism in the department.