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