Answer:
The assassination of Archduke Franz Ferdinand was the immediate cause of a war between two great powers—Russia and the Habsburg Austro-Hungarian Empire.
Explanation:
The war was started by the leaders of Germany and Austria-Hungary. Vienna seized the opportunity presented by the assassination of the archduke to attempt to destroy its Balkan rival Serbia
It’s B because the North no longer had slaves to farm there crops and the south did so they had an advantage in the area.
I think it was called Ecomienda.
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