Alexander von Humboldt's American expedition from 1799-1804
Own work (original text: Topographic map: vmap0 (Vector Map Level 0), Dates and Positions: Alexander von Humboldt Chronologie) 
Boundaries: 

File:Location Viceroyalty New Granada.png
http://en.wikipedia.org/wiki/Image:Viceroyalty_of_New_Granada.GIF
http://commons.wikimedia.org/wiki/Image:United_States_1804-03-1804-10.png
http://commons.wikimedia.org/wiki/Atlas_of_the_United_States
Boundaries of United States with territories (before Louisiana Purchase)
Alexrk translated by Cäsium137 (T.)