How does the 14th amendment define citizenship?

All people who are born or naturalized in the United States of America and are subject to its jurisdiction, are citizens, according to the 14th Amendment of the US Constitution.  

Explanation:

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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