Answer:
It is important for historians to create graphs from primary sources for the purpose of getting the information more clearly and visually so everybody can access the information a can understand it. A primary source is the one that was the product of people who witnessed the event or the incident.
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The answer is Britain <span />
How did the assassination lead to ww1? In an event that is widely acknowledged to have sparked the outbreak of World War I, Archduke Franz Ferdinand, nephew of Emperor Franz Josef and heir to the Austro-Hungarian Empire, is shot to death along with his wife by a Serbian nationalist in Sarajevo, Bosnia, on this day in 1914.