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Visualizing US expansion through post offices

Derek Watkins created  this visualization about the expansion of the United States as seen by the establishment of US post offices. The animation was created with Processing software, and the post office location data was collected from the USPS Postmaster Finder. Watkins states that the data had some flaws. 10% of the post offices failed to link to map locations. Also all closed down post offices did not appear on the map. Nonetheless, Watkins summarizes some interesting findings:

1776 – Several new post offices crop up along the east coast after the Revolution.

1846 – Rash of openings in Texas after statehood and the end of the Mexican-American War.

1848 – First offices established on the west coast, with lots of activity afterwards, likely due to gold rushes and CA statehood.

1851 – New Mexico and Utah start to see some activity as they become territories. I especially like the lines extending from Santa Fe along the Rio Grande / El Camino Real.

1860s – No activity in the South during the Civil War; also an interesting sweep across the Great Plains, with Oklahoma remaining conspicuously quiet.

1870s – Distinct traces along railroads in Nebraska and Kansas.

1890s – Oklahoma lights up due to several land rushes.