In order to allow for the installation of scaffolding and floor, statuary, and artwork protection in conjunction with the Dome Restoration Project, the Rotunda of the Capitol will be closed from Monday, July 27 through Monday, September 7. While the Rotunda is unavailable for tours, an alternate tour route will be provided. The Capitol Visitor Center is open during the closure of the Rotunda and will offer special activities which do not require advance reservations. You can also download our new U.S. Capitol Rotunda app.

Exhibit Theme

Surveying the Mexican Border

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Boundary between the United States...
Image Caption

Boundary between the United States and Mexico, map by William H. Emory, 1855

Between 1849 and 1857, the Army Corps of Topographical Engineers marked and mapped the U.S.-Mexico boundary and published a report on natural features of the borderland. The vast new western territories immediately became a focus of congressional dispute regarding slavery in new states. This map shows the border between New Mexico and Chihuahua, Mexico.

Geography and Map Division, Library of Congress