What does it mean for the Balkans to have a problem with nationalism?

Nationalist tension resurrected in the Balkans. The Balkans successfully overthrew the Ottoman Empire, but soon after, the now independent Balkan states yearned for more land & started fighting among themselves. These resulted in a series of wars.

Explanation:

Appeasement at Munich in 1938

Explanation:

The event which the liberal perspective identifies as a critical event in the timeline before World War II was "Appeasement at Munich in 1938."

The Appeasement at Munich in 1938 was an agreement signed by Germany, Italy, Great Britain, and France to make Czechoslovakia surrender its border provinces and defenses to Nazi Germany. However, instead of settling whatever disputes, that might have existed between these nations in Europe, it rather contributed to the world war II outbreak whereby it encouraged the Germans to seek territorial expansion.