The answer is Pan-Slavism
Answer:
My guess would be to try to save people from dying
Explanation
In the graph it shows an increase in dying between the 1960's. People would protest to help the population and to save people from more devastation and loss. They might also protest to save families from having to mourn over dead family members
I hope this helps good luck ^^
They were able to grow their own food which was a plus for them since the rainfall helped increase their chances of getting food. Hopefully, this helps you. ^^