Answer:
World War I resulted from a "chain reaction"
Explanation:
This Political cartoon is titled "Der Stänker" which translates to "The Troublemaker".
It was originally published in August 1914, in the German magazine known as Kladderadatsch.
It illustrated the nations of Europe sitting at a table. From the cartoon, it was revealed that the Central Powers in contrast to Russia was unhappy about small Serbia joining the table.
In the following event, out of nowhere, Serbia attack Austria - Hungary from the back. While Germany offers support to Austria, Russia and France made a pact without other nation's knowledge.
Consequently, Austria mauled Serbia, and Germany, in response to the Russia-France pact, allied with the Ottoman Empire. In the background, France wants to ally with Britain.
In the end, Germany and France went into the fight, this caught Britain by surprise, while the new country seems to join the fight, presumably, Japan.
Hence, the best summary for this cartoon is "World War I resulted from a "chain reaction"