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Cannons and gattling guns existed when the constitution was drafted.

The Gatling gun is one of the best-known early rapid-fire spring loaded, hand cranked weapons and a forerunner of the modern machine gun. Invented by Richard Gatling, it is known for its use by the Union forces during the American Civil War in the 1860s, which was the first time it was employed in combat...

The Gatling gun was designed by the American inventor Dr. Richard J. Gatling in 1861...

Prior to the Gatling gun, the only weapons available to military forces capable of firing many projectiles in a short space of time were mass-firing volley weapons, like the Belgian and French mitrailleuse of the 1860s and 1870s, and field cannons firing canister shot, much like an upsized shotgun.