The American and French Revolution strengthened the idea of nationalism. In parts of Europe and later in the rest of the world, people began to identify themselves with a particular nation. This growing feeling of belonging to a nation led to the formation of nation-states.

Many countries of Europe, which were so far divided into a number of small regions, tried to unite themselves. In Europe, England and France were the first countries to emerge as independent nation-states.

The attempts to overthrow foreign rule and form independent nation-states intensified in the latter half of the nineteenth century AD. There were attempts at national unification in Greece, Poland, Germany, Italy and many other European countries. Germany emerged as a united state largely due to the efforts of Otto von Bismarck. The Italian Unification Movement was led by Giuseppe Garibaldi and Giuseppe Mazzini. They succeeded in making Italy a unified and independent nation. In the twentieth century AD, this spirit of nationalism spread throughout the world.