How did the sinking in lusitania in 1915 effect world war 1?

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Who were the main leaders of the major powers (france, england, and great britain) during the treaty of versailles?

Thomas jefferson was important in the revolutionary era because a) he wrote much of the declaration of independence. b) he was elected the president of the continental congress. c) his philosophies were used in the influential pamphlet common sense. reactivate d) his leadership and moral stand lead to the colonies to fight for the abolition of slavery.