What single event started a chain of events leading to the war

         However, there was one single event, the assassination of Archduke Ferdinand of Austria, which started a chain of events leading to war. In the years leading up to the war, the nations of Europe were constantly jockeying for power and making alliances. Germany made an alliance with Austria-Hungary and Italy in 1881.

Explanation:

        For example. The chain reactions in history are how one event led to another. For example, the assassination of Franz Ferdinand led to World War 1 because when Austria declared war on Serbia. ... Dividing Europe into two hostile sections and creating a huge international war.

hello there!

the graphics that you have attached within the question, indicates that few people in bolivia work in industry according to its labor force.

however, the graphic that is on the right side of the picture shows the gdp sector in bolivia. this gross domestic product is a macroeconomic magnitude   that shows the monetary value of all finished goods and services within a country's borders in a specific time period. in this case, the graphic is showing the monetary value in each sector -agriculture, industry and services- of bolivia in 2012.

so, although the first graphic located at the left side indicates that not so many people work in industry, this is the second most important sector according to the gdp metrics because of the monetary value that impacts on its country. it does not need to be the most valuable one. if it makes an impact on the country's economy, it will be definitely crucial to it.