Answer: The Dred Scott decision basically said that slavery would be legal in all states of the Union. Living in a free state did not make a slave free. A Slave owner could bring his slaves with him into a free state that had voted to outlaw slavery.
This was the 21st Amendment: the Amendment that repealed the 18th Amendment to the constitution.
The 18th Amendment was the Amendment that introduced the Prohibition for alcoholic drinks; so the 21st Amendment established a permission for the possession of alcoholic drinks.
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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.
