Share This Article 1. Aaron Burr held this office when he killed Alexander Hamilton in a duel. Secretary of State Governor of New York Vice-President Secretary of the Treasury 2. The U.S. government officially declared this weapon obsolete in 1911. The M1857 12-pounder “Napoleon” The 10-pounder Parrot Rifle The Whitworth Rifle The Gatling gun 3. These islands were the only US territory occupied by the enemy during World War Two. Bikini and Cocos Islands Nihoa and Necker Islands Attu and Kiska Islands The US Virgin Islands Loading …