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    Isaac Stevens was chosen to lead the military survey crew mapping a route for a transcontinental railroad in 1853. A graduate of West Point, Stevens distinguished himself as an explorer as well as a politician. Governor of Washington Territory, Stevens was a military engineer placed in charge of surveying the northernmost route between the 47th and 49th parallels (latitude).

    Zephyr along the Bookcliffs by Moffat Road, via Flickr

    Train with the Tacoma Narrows Bridges, Tacoma, Washington | Flickr - Photo Sharing!

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    Railroad

    Old railroad tunnel

    Forest railroad

    Fisher Railroad Bridge, Vermont

    Autumn Along the 'Cuyahoga Valley Scenic Railroad'!

    The Hills of Osier - Conejos County, Colorado- an old railroad settlement and train stop approximately halfway along the Cumbres and Toltec Scenic Railroad

    Old Passumpsic River Railroad Bridge Abandoned Warren through truss bridge over the Passumpsic River on the former Maine Central Railroad in St. Johnsbury, Vermont.

    Mississippi River Map, 1826

    Map showing the locations of the Ohio mound builders works

    Timeline map of when the United States acquired major territories, from Family Tree Magazine.

    underground railroad

    United States in 1789, showing the State territorial claims, territories, and areas of territorial dispute. Color–coded to show States, territories, British possessions, and Spanish possessions, and shows the Northwest Territory north of the Ohio River, the...