What kept the different ethnic groups of Yugoslavia together as one Nation?

Brainliestttme : ) how are developed nations and developing nations similar? both have membership in multinational groups. both experience high death rates. both experience low infant mortality rates. both have high per capita income.

Plz 50 points answer only if you know and don't copy answer describe how the geography of the korean peninsula affected where people settled and how they lived.

Which of these events related to the protestant reformationoccurred first in 1521?