When? Where?
“As we know, learning from the past, those kind of questions sometimes end in war,” he said.
When? Where?
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The French Revolution for one.
“These (other) problems were all compounded by a great scarcity of food in the 1780s. A series of crop failures caused a shortage of grain, consequently raising the price of bread. Because bread was the main source of nutrition for poor peasants, this led to starvation. The two years previous to the revolution (1788-89) saw bad harvests and harsh winters, possibly because of a strong El Niño cycle[11] caused by the 1783 Laki eruption at Iceland[12]. The little ice age was also affecting agriculture: many other areas of Europe had adopted the potato as the staple crop by this time, whereas the French generally refused it as a dirty food or the devil’s food. The potato was more resilient to the colder temperatures during the little ice age and also could not be easily destroyed by scorched earth warfare[13]. A normal worker earned anywhere from 15 to 30 sous a day while skilled workers received 30 to 40 sous. A family of four would need about 2 loaves of bread a day to survive. The price of bread rose by 88 percent in 1789, going from 9 sous to 14.5/15 sous[citation needed]. Many peasants were relying on charity to survive. The peasantry became a class with the ambition to counteract social inequity and put an end to food shortages. The ‘bread riot’ evolved into a central cause of the French Revolution.”
http://en.wikipedia.org/wiki/Causes_of_the_French_Revolution