The two most important 19th-century books on archaeology in the United States both dealt with earthworks. The earlier of these two, Ancient monuments of the Mississippi Valley by Ephraim G. Squier & Edwin H. Davis, was the first volume published by the fledgling Smithsonian Institution, and is 150 years old this year. It presented, with lavish illustrations, information about hundreds of earthworks. Its principal argument was that the mounds had been built by an American race distinct from the historically known indigenes, no less and perhaps considerably more than 1000 years ago. This volume in no small measure catalysed the development of archaeology in the United States. Without Squier & Davis’ extensive documentation of the vast number, size, complexity and variety of earthworks, the later book might never have been commissioned or might have been conceived in far less ambitious terms.
