Rubuta ci gaba don wannan sakin layi - A 1854, an shirya yankin Kansas, sannan a 1861 Kansas ta zama jihar Amurka ta 34. An kafa Gundumar Decatur a ranar 20 ga Maris, 1873 kuma an tsara ta a ranar 15 ga Disamba, 1879. An sanya masa suna ne don jarumin yaƙin Navy Commodore Stephen Decatur, Jr., wanda ya yi aiki a lokacin Yaƙin Barbary na Farko
da Yaƙin Barbary na biyu da Yaƙin 1812.