number 3: Migration of people
This is a little open for interpretation, but I would generally say that the best answer is that Josip Broz Tito was a very powerful leader, who kept the republics and the different groups together.
For example, we can see this from the fact that the first conflict happened in 1981: one year after his death ( a protest of Kosovans who demanded autonomy).
Answer:
In simple terms, a PIL is a petition that an individual or a non-government organisation or citizen groups, can file in the court seeking justice in an issue that has a larger public interest. It aims at giving common people an access to the judiciary to obtain legal redress for a greater cause
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