Washington, D.C. -- According to a Gallup/Harris poll released Monday, a full 37 percent of American citizens are incapable of identifying their home country on a map of the United States.

Of the 1,400 residents surveyed, the most common incorrect responses placed the more than 230-year-old territory in the Atlantic or Pacific Oceans (19 percent), the space where Mexico would appear were it in fact included on the map (10 percent), and inside the word...