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Hi,
The Lusitania was sunk in 1915 and the US did not enter the war until almost two years after the sinking. The sinking of the Lusitania and the American reaction to that sinking caused the Germans to temporarily halt their policy of unlimited submarine warfare.
Side note: Found the answer with this link :)
https://www.enotes.com/homework-help/what-impact-did-sinking-lusitania-have-what-came-418703
Answer:
New ways of governing were needed.
The people migrated to other lands.
The amount of trade dropped dramatically.
New schools were created to train scholars.
The war started mainly because of four aspects Militarism Alliances Imperialism and Nationalism. This is because big armies become potential threats to other countries.
hope this helps
Because it had a great effect on history.