Respuesta :

When having pride of a certain country, it is called nationalism. 

Too much nationalism can cause problems, one of the causes of WW1 was nationalism. 
i'd say its patriotism.

patriotism: love for or devotion to one's country.

i was going to say nationalism but the dictionary definition of nationalism (nationalism: patriotic feeling, principles, or efforts) is basically referring back to patriotism, so :-)