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World War I was fought 1914-1918. The U.S. consisted of 48 states during WWI. The 48 states and year of admission to the Union are Delaware (1787), Pennsylvania (1787), New Jersey (1787), Georgia (1788), Connecticut (1788), Massachusetts (1788), Maryland (1788), South Carolina (1788), New Hampshire (1788), Virginia (1788), New York (1788), North Carolina (1789), Rhode Island (1790), Vermont (1791), Kentucky (1792), Tennessee (1796), Ohio (1803), Louisiana (1812), Indiana (1816), Mississippi (1817), Illinois (1818), Alabama (1819), Maine (1820), Missouri (1821), Arkansas (1836), Michigan (1837), Florida (1845), Texas (1845), Iowa (1846), Wisconsin (1848), California (1850), Minnesota (1858), Oregon (1859), Kansas (1861), West Virginia (1863), Nevada (1864), Nebraska (1867), Colorado (1876), North Dakota (1889), South Dakota (1889), Montana (1889), Washington (1889), Idaho (1890), Wyoming (1890), Utah (1896), Oklahoma (1907), New Mexico (1912), Arizona (1912). Alaska (1959), and Hawaii (1959) were admitted to the Union after WWI.

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