---
title: Map of Westward Exploration and Settlement of the USA c.1855
author: Simeon Netchev
source: https://www.worldhistory.org/image/17202/map-of-westward-exploration-and-settlement-of-the/
format: machine-readable-alternate
license: Creative Commons Attribution-NonCommercial-NoDerivs (https://creativecommons.org/licenses/by-nc/4.0)
updated: 2026-02-24
---

# Map of Westward Exploration and Settlement of the USA c.1855

_Authored by [Simeon Netchev](https://www.worldhistory.org/user/simeonnetchev/)_

## Image File

[![Map of Westward Exploration and Settlement of the USA c.1855](https://www.worldhistory.org/uploads/images/17202.png)](https://www.worldhistory.org/uploads/images/17202.png)

## Image Caption

The *[Louisiana Purchase](https://www.worldhistory.org/Louisiana_Purchase/)* (1803), negotiated during the presidency of [Thomas Jefferson](https://www.worldhistory.org/Thomas_Jefferson/) (reign 1801–1809) and concluded under [Napoleon Bonaparte](https://www.worldhistory.org/Napoleon_Bonaparte/) (as First [Consul](https://www.worldhistory.org/Consul/) of France, reign 1799–1804; Emperor 1804–1814/15), doubled the territorial size of the United States and reoriented its strategic horizon toward continental expansion. Acquired through treaty rather than [conquest](https://www.worldhistory.org/warfare/), the vast trans-Mississippi lands transformed the geopolitical balance of North America and set in motion sustained exploration, surveying, and settlement. What had previously been an uncertain interior became the focus of state-sponsored expeditions, commercial ventures, and migratory flows that would redefine the political, economic, and demographic landscape of the 19th century.

Jefferson’s *Corps of Discovery*, led by Meriwether Lewis and William Clark (1804–1806), established a transcontinental route via the Missouri and Columbia river systems, expanding geographic knowledge and reinforcing American claims to the Pacific Northwest. Over subsequent decades, traders, missionaries, military surveyors, and settler caravans traced and formalized overland corridors toward Oregon, California, and the Southwest. By 1820, approximately two million of the nation’s ten million inhabitants lived west of the Appalachians, reflecting accelerating internal migration. The concept of *“Manifest Destiny,”* coined in 1845, articulated a prevailing ideological justification for expansion, though this process also entailed displacement and dispossession of [Native American](https://www.worldhistory.org/Native_Peoples_of_North_America/) nations.

#### Editorial Review

This human-authored image has been reviewed by our editorial team before publication to ensure accuracy, reliability and adherence to academic standards in accordance with our [editorial policy](https://www.worldhistory.org/static/editorial-policy/).

## About the Author

Simeon is a freelance visual designer and history educator, passionate about the human stories that shape the past.
- [Linkedin Profile](https://www.linkedin.com/in/simeon-netchev/)

## Cite This Work

### APA
Netchev, S. (2023, March 20). Map of Westward Exploration and Settlement of the USA c.1855. *World History Encyclopedia*. <https://www.worldhistory.org/image/17202/map-of-westward-exploration-and-settlement-of-the/>
### Chicago
Netchev, Simeon. "Map of Westward Exploration and Settlement of the USA c.1855." *World History Encyclopedia*, March 20, 2023. <https://www.worldhistory.org/image/17202/map-of-westward-exploration-and-settlement-of-the/>.
### MLA
Netchev, Simeon. "Map of Westward Exploration and Settlement of the USA c.1855." *World History Encyclopedia*, 20 Mar 2023, <https://www.worldhistory.org/image/17202/map-of-westward-exploration-and-settlement-of-the/>.

## License & Copyright

Submitted by [Simeon Netchev](https://www.worldhistory.org/user/simeonnetchev/ "User Page: Simeon Netchev"), published on 20 March 2023. The copyright holder has published this content under the following license: [Creative Commons Attribution-NonCommercial-NoDerivs](https://creativecommons.org/licenses/by-nc/4.0deed.en). This licence only allows others to download this content and share it with others as long as the author is credited, but they can't change the content in any way or use it commercially. When republishing on the web a hyperlink back to the original content source URL must be included. Please note that content linked from this page may have different licensing terms.