Final answer:
The ethnic diversity in the Hapsburg Empire of Austria-Hungary in the mid-nineteenth century led to nationalism, revolutions, and concessions. The empire transformed into a dual monarchy.
Step-by-step explanation:
The ethnic diversity in the Hapsburg Empire of Austria-Hungary in the mid-nineteenth century had significant effects. The empire was made up of various ethnicities such as Hungarians, Czechs, Ukrainians, Poles, Romanians, Croats, Serbs, and others. The ethnic diversity in the Hapsburg Empire of Austria-Hungary in the mid-nineteenth century led to nationalism, revolutions, and concessions. The empire transformed into a dual monarchy.
Many of these ethnic groups desired their own nations, leading to a wave of nationalism and revolutions in 1848. Although the Hapsburgs managed to maintain control, they had to make concessions such as granting the Hungarians their own legislature and giving some regions autonomy. The empire eventually transformed into a dual monarchy, known as the Austro-Hungarian Empire, which further spread out the nationalist problem.