Nationalism and the creation of Italy

Nationalism is ideology, a sentiment, a form of culture or a social movement that focuses on the nation. Nationalism is also people fighting for their country or dieing in the name of their country. There are many examples of Nationalism in World History such as the Austrian-Hungarian empire which was once a massive country now made up of several countries such as Romania, Poland, Serbia, Italy, Czech Republic, Croatia etc. The people of these countries thought they speak Romanian and we speak Czech then why are we 1 big country? This gave them the thought to fight for their country and gain independence and become just 1 country instead of a massive country made up of many countries such as the Austrian-Hungarian empire. Another example of Nationalism is Italy when it was made up of many states instead of just 1 big Country. The people of Italy thought that we have the same Language, Religion and basically the same culture then why are we not just 1 country. This thought gave them to fight for Independence from other countries and form 1 large country known as Italy.