| 100th Meridian West |
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| lines of longitude | |
| boundaries of u.s. states | |
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The meridian 100° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean , North America , the Pacific Ocean , the Southern Ocean , and Antarctica to the South Pole . In Canada , the meridian 100° west of Greenwich passes through Nunavut and Manitoba . In the United States , the meridian 100° west of Greenwich passes through North Dakota , South Dakota , Nebraska , Kansas , Oklahoma , and Texas . The meridian 100° west of Greenwich forms the eastern border of the Texas Panhandle with Oklahoma (which traces its origin to the Adams-Onís Treaty in 1819 which settled the border between New Spain and the United States between the Red River and Arkansas River ). In México , the meridian 100° west of Greenwich passes through Coahuila De Zaragoza , Nuevo León , Tamaulipas , San Luis Potosi , Guanajuato , Querétaro De Arteaga , Estado De México , and Guerrero . In the central Great Plains of the United States , the meridian 100° west of Greenwich roughly marks the western boundary of the normal reach of moist air from the Gulf Of Mexico . The type of Agriculture west of the meridian typically relies heavily on Irrigation . Historically the meridian has often been taken as a rough boundary between the eastern and western United States. White settlement, spreading westward after the American Civil War , encroached in the meridian in the 1870s . A sign across U.S. Highway 30 in Cozad , Nebraska prominently marks the place where the meridian intersects the routes of the Oregon Trail , Pony Express , Transcontinental Railroad , and the Lincoln Highway . The song "At the Hundredth Meridian" by The Tragically Hip is about the 100th meridian west. SEE ALSO |
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