Which event lit a “powder keg” in europe and led to the start of world war i? russia joined a war between austria-hungary and serbia.  austria-hungary declared war on serbia due to ethnic uprising. archduke franz ferdinand was assassinated by a serbian nationalist. archduke franz ferdinand stopped a revolt of serbian nationalists.

The event that lit a "powder keg" in Europe and led to the start of World War I was the assassination of Archduke Franz Ferdinand by a Serbian nationalist. This assassination put in motion a number of pre-existent causes such as nationalism, imperialism, and a net of previous alliances between the major powers involved.

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the process is called revolution because it was a process of great economic-social transformations that began in england in the xviii century.

the industrial mode of production spread throughout much of the northern hemisphere throughout the xix and early xx centuries.

the effect of this revolution was the distance between the countries, with respect to economic and political power.   after all, not all industrialized at the same time, remaining in the condition of suppliers of raw materials and agricultural products to the industrialized countries.

these differences mark to this day the nations of the world that are divided between developed and developing countries. one way to measure whether a country is advanced is to assess how industrialized it is.