3. _Geography, Maps, &c._ The knowledge of the regions and localities inhabited by mankind, or where colonies are sent, empires founded, is needful to history, in order to understand and treat the events and migrations. The physical configuration of the land, the climates, plains, mountains and streams, have a great influence on civilization and communications. Physical geography is constant and invariable: while civil or ethnographical geography is constantly fluctuating in limits and names.
If we had complete series of maps by chronological order upon America; we should find therein the materials for a comparative historical geography, and successive ethnography, showing the gradual revolutions of mankind. The old maps of America, those of Laet, the old geographers &c. are very valuable for this object. Many travellers in America, have given original maps, which furnish similar materials. I have chiefly used for Peru and Austral America, the maps of Laet, Acarete, D'Anville, Molina, Falkner, Cochrane, Wedel, the Jesuits, &c. Among the modern general maps, relating to South America, the Spanish maps of 1810 and 1822, the English of 1815, the French of 1830, the latest American of Tanner, &c. By those materials I have been able to trace and fix four periods of American geography, 2 ancient and 2 modern.
II. Ancient ditto, or between 1400 and 1500.
I have formed Mpt. maps of the two first periods, which shall be published gradually, or in my Illustrations of the Ancient Geography of America. We have thousands of maps on the early geography of the Eastern Hemisphere, and no one as yet on the Western Hemisphere! to show the respective limits and positions of Ancient Empires, Nations, Cities, &c., except Clavigero's map of Anahuac at the Spanish conquest, those of Hayti, Laet, &.c.
We have the plans of Ancient Mexico and Cuzco; but lack those of Tiahuanaco, Otolum, and many more important for ancient history. Several plans of ancient sites of civilization have been given, along with those of monuments. I have many in Mpt. yet unpublished. The greatest part of modern cities, are built on ancient sites, from Mexico to Chili. In North America, the same happens with Cincinnati, Louisville, Pittsburg, St. Louis, Philadelphia, Savannah, &c. The views of ruined cities, and those of actual cities, are partly historical, connected with the knowledge of gradual American civilization.