What country had the greatest influence on the spread of nationalism throughout Europe because of the conquest of who helped to spread the nationalist ideas through the continent

One country that had a significant influence on the spread of nationalism throughout Europe was France. The conquests of Napoleon Bonaparte in the early 19th century helped to spread nationalist ideas through the continent. Napoleon's military campaigns and the establishment of the Napoleonic Code inspired nationalist movements in other European countries, as people sought to emulate France's political and social transformations. Additionally, the spread of French revolutionary ideals, such as liberty, equality, and fraternity, also played a role in fueling nationalist sentiments across Europe.