#1 Alabama-Mississippi (since 1844) |
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#2 Kansas-North Dakota (since 1900) |
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#3 Indiana-South Dakota (since 1916) |
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#4 Idaho-Utah (since 1916) |
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#5 Oklahoma-Virginia (since 1924) |
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#6 Connecticut-Michigan (since 1944) |
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#7 Colorado-Montana (since 1948) |
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#8 Ohio-Tennessee (since 1948) |
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#9 Illinois-New Jersey (since 1952) |
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#10 California-Vermont (since 1952) |
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#11 Hawaii-Rhode Island (since 1960) |
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#12 North Carolina-South Carolina (since 1968) |
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#13 Arkansas-Louisiana (since 1968) |
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#14 Delaware-Pennsylvania (since 1972) |
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#15 New York-Wisconsin (since 1972) |
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#16 Oregon-Washington (since 1972) |
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#17 District of Columbia-Minnesota (since 1976) |
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#18 Arizona-Florida (since 1980) |
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#19 Iowa-New Mexico (since 1992) |
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