What start world war 1 and end it?

many things started ww1 including secret alliances between countries, imperialsim, nationalism and politics. one big cause was the assassination of Archduke Ferdinand of Austria and this started a chain of events leading up to the war.

The Treaty Of Versailles ended the war. The allied nations (Britain, France, Russia, Italy) and Germany all agreed to sign the treaty of versailles which was what ended the war.

hope this helps!

it might have bin the atomick bomb that the amaricans dropd in a city called haroshima and evaperated 17,000 people instently it is terribal thay shouldent have done that emagin if u wear just minding your own bisnes and bam 1 second later the city you grew up in your famaly are gon in a instant emagan that just made millions of people in new generations not possible like tose peoples grand kids could have ended hunger or made life better of became president but know thay killed of a million gennerations to come sorry i just think its was rong

Explanation:

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the answer is b. hope this !