South Asia, Australia, Europe, the Americas.
The cheap labor in the form of slaves.
Those serbs were convicted of War crimes because they approve the policy of ethnic cleansing in the war.
Ethnic cleansing refer to the policy in which they massacre a specific ethnic groups in their society. This practice deemed as really inhumane so they had to be convicted because of that
Phalanx was the battle formation that produced the most powerful fighting force in the ancient world