1. References.

Bibliographies.—L. Farrand, Basis of American History, ch. xviii.; J. Larned, Literature of American History, 21-50; J. Winsor, Narrative and Critical History, I., II.; Channing and Hart, Guide, §§ 21, 77-80; C. Lummis, Reading List on Indians.

Historical Maps.No. 1, this volume (Epoch Maps, No. [1]); T. MacCoun, Historical Geography of United States; school histories of Channing, Elson, Gordy, James and Sanford, Mace, McLaughlin, McMaster, and Montgomery.

General Accounts.—Historical significance of geography of the United States: H. Mill, International Geography, ch. xxxix.; F. Ratzel, Vereinigte Staaten, I. ch. ii.; B. Hinsdale, How to Study and Teach History, ch. xiv.; E. Bogart, Economic History of United States, introduction; E. Semple, American History and its Geographic Conditions; A. Brigham, Geographic Influences in American History; W. Scaife, America: its Geographical History.—Topographical descriptions of the country: J. Whitney, United States, I. pt. i.; N. Shaler, United States, I., and Nature and Man in America; Mill, as above; E. Reclus, North America, III.; Hinsdale, as above, ch. xv.—Prehistoric Man in America: L. Morgan, Ancient Society; J. Nadaillac, Prehistoric America; J. Foster, Prehistoric Races; Winsor, as above, I. ch. vi.; E. Avery, United States and its People, I. chs. i., ii.; Farrand, as above, ch. v.—The Indians (or Amerinds): D. Brinton, American Race; C. Thomas, Indians in Historic Times; F. Hodge, Handbook of American Indians; Farrand, as above, chs. vi.-xviii.; Avery, as above, I. ch. xxii.; F. Dellenbaugh, North Americans of Yesterday; S. Drake, Aboriginal Races of America; G. Ellis, Red Man and White Man in North America; G. Grinnell, Story of the Indian. The introduction to F. Parkman, Jesuits in North America, and his Conspiracy of Pontiac, I. ch. i., are admirable general surveys. Briefer, also excellent, is J. Fiske's Discovery of America, I. ch. i. The mound-builders have now been identified as Indians. L. Carr, Mounds of the Mississippi Valley Historically Considered is the best exposition of this subject. C. Thomas, Catalogue of Prehistoric Works East of the Rocky Mountains is useful.

Special Histories.—Larned, History for Ready Reference, I. 83-115, gives brief account and bibliographies of tribes; Farrand, as above, 279-286, does the same by geographical groups. Especially notable are L. Morgan, League of the Iroquois, and C. Colden, Five Indian Nations. For detailed treatment of the aborigines of that section, consult H. Bancroft, Native Races of the Pacific Coast, II., and Mexico, I.; J. Palfrey, New England, I. chs. i., ii., describes the Indians in that region; T. Roosevelt, Winning of the West, I. chs. iii., iv., the Southern tribes; and Parkman, Pontiac, the old Northwest tribes. There are numerous biographies of chiefs, and a considerable literature on border warfare.

2. Physical Characteristics of North America.

Origin of the native races,

Whence came the native races of America? Doubtless the chain of Aleutian islands served as stepping-stones for straggling bands of Asiatics to cross over into continental Alaska many centuries ago; others may have traversed the ice-bridge of Bering's Strait; possibly prehistoric vessels from China, Japan, or the Malay peninsula were blown upon our shores by westerly hurricanes, or drifted hither upon the ocean currents of the Pacific. There are striking similarities between the flora on each shore of the North Pacific; and the Eskimos of North America, like the West-Slope Indians of South America, have been thought to exhibit physical resemblances to the Mongols and Malays. |a mere matter of conjecture. | On the other hand, some archæologists hold that men as far advanced as the present Eskimos followed the retreating ice-cap of the last glacial epoch. In the absence of positive historical evidence, the origin of the native peoples of America is a mere matter of conjecture.

Difficulties of colonization from the west.

North America could not, in a primitive stage of the mechanic arts, have been developed by colonization on any considerable scale from the west, except in the face of difficulties almost insuperable. The Pacific coast of the country is dangerous to approach; steep precipices frequently come down to the shore, and the land everywhere rises rapidly from the sea, until not far inland the broad and mighty wall of the Cordilleran mountain system extends from north to south. That formidable barrier was not scaled by civilized men until modern times, when European settlement had already reached the Mississippi from the east, and science had stepped in to assist the explorers. At San Diego and San Francisco are the only natural harbors, although Puget Sound can be entered from the extreme north, and skilful improvements have in our day made a good harbor at the mouth of Columbia River. The rivers of the Pacific Slope for the most part come noisily tumbling down to the sea over great cliffs and through deep chasms, and cannot be utilized for progress far into the interior.