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the missouri river to explore the new territory, and the united states and spain hovered on the brink of an undeclared war over the exact location of the boundary between them. as humboldt spread out those maps of mexico, the keenest question on the minds of those three american heads of state was the location of that disputed border and the nature of the lands it did or did not include. three days after their first meeting, jefferson wrote humboldt urgently that the question is this: spain claims the land from the mississippi west along red river. we claim the land from the rio grande north. .. what was more his method than his instructions to future exploring expeditions would guarantee that never again would the united states government failed as it had with the lewis and clark expedition to leverage from them staggering amount of scientific information. in future letters jefferson would marvel at the timing to make countries known to the world and the moment they we ....