by Spain and the Holy Roman Empire in the ensuing Italian Wars (1494–1559). France in the early modern era was increasingly centralised; the French language began to displace other languages from official use, and the monarch expanded his absolute power, albeit in an administrative system (the Ancien Régime) complicated by historic and regional irregularities in taxation, legal, judicial, and ecclesiastic divisions, and local prerogatives. Religiously France became divided between the Catholic majority and a Protestant minority, the Huguenots, which led to a series of civil wars, the Wars of Religion (1562–1598). The Wars of Religion crippled France, but triumph over Spain and the Habsburg monarchy in the Thirty Years' War made France the most powerful nation on the continent once more. The kingdom became Europe's dominant cultural, political and military power in the 17th century under Louis XIV. In parallel, France developed its first colonial empire in Asia, Africa, and in the Americas. From the 16th to the 17th centuries, the First French colonial empire stretched from a total area at its peak in 1680 to over 10,000,000 square kilometres (3,900,000 sq mi), the second largest empire in the world at the time behind only the Spanish Empire. Colonial conflicts with Great Britain led to the loss of much of its North American holdings by 1763. French intervention in the American Revolutionary War helped secure the independence of the new United States of America but was costly and achieved little for France. The Kingdom of France adopted a written constitution in 1791, but the Kingdom was abolished a year later and replaced with the First French Republic. The monarchy was restored by the other great powers in 1814 and lasted (except for the Hundred Days in 1815) until the French Revolution of 1848. Political history West Francia During the later years of the elderly Charlemagne's rule, the Vikings made advances along the northern and western perimeters of the Kingdom of the Franks. After Charlemagne's death in 814 his heirs were incapable of maintaining political unity and the empire began to crumble. The Treaty of Verdun of 843 divided the Carolingian Empire into three parts, with Charles the Bald ruling over West Francia, the nucleus of what would develop into the kingdom of France. Charles the Bald was also crowned King of Lotharingia after the death of Lothair II in 869, but in the Treaty of Meerssen (870) was forced to