Yes. I just don't know if the U.S. would send troops to stop it or not. I doubt that Americans have such an unquencheable thirst for blood that they would demand the deaths of Missourians over the issue of freedom-but you never can tell
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In 1861, several US states DID attempt to declare their independence from the US- the result was the American Civil War- so, no, they do not have the right, and yes, the US HAS sent troops to prevent it in the past.
independence hall, philidephia
1776
Britain.
England
July 4, 1776
The Declaration of Independence
declare our independence from Britain
King George III
July 9th 1776
Missouri
July 4th, 1777... Are you American?
July 4, 1776 in Philadelphia, Pennsylvania.