<span>a) the detonation of a bomb on Russian soil
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The immediate cause for World War 1 was the assassination of the Archduke Franz Ferdinand of Austria and his pregnant wife Sophie. Archduke Franz Ferdinand of Austria was the nephew of Emperor Franz Josef and heir to the throne of Austria and Hungary.
Was a campaign slogan of the republican party
I would say tis ture. i studied this and i believe it was correct. sorry if im wrong tho