Wyoming is on the cusp of a needed improvement of their Constitutional Carry law. In 2011, Wyoming was only the third state to restore Constitutional Carry.
Constitutional Carry is a close approximation of the state of law that existed when the Second Amendment was ratified in the United States, in 1791. At that time, there were no permits required to carry weapons in most public spaces, either openly or concealed.
State governments and the Federal government did not impose legal burdens on the carry of weapons, openly or concealed, for two generations after the ratification of the Second Amendment.
Gradual infringements on the carry of arms were passed in some states in fear of slave revolts, newly freed slaves after the Civil War, and during the Progressive era.