Which two countries contributed the most to the spread of nationalism in Europe?

The two countries that contributed the most to the spread of nationalism in Europe are France and Germany. France's revolutionary ideas and campaigns for national unity in the 18th and 19th centuries inspired many other European countries to strive for independence and national identity. Meanwhile, Germany's unification in 1871 under Prussian leadership paved the way for the rise of nationalism across the continent, as other nations looked to emulate its success.