The American frontier is sharply distinguished from the European frontier—a fortified boundary line running through dense populations. The most significant thing about the American frontier is, that it lies at the hither edge of free land. In the census reports it is treated as the margin of that settlement which has a density of two or more to the square mile. The term is an elastic one, and for our purposes does not need sharp definition. We shall consider the whole frontier belt, including the Indian country and the outer margin of the "settled area" of the census reports. This paper will make no attempt to treat the subject exhaustively; its aim is simply to call attention to the frontier as a fertile field for investigation, and to suggest some of the problems which arise in connection with it.

In the settlement of America we have to observe how European life entered the continent, and how America modified and developed that life and reacted on Europe. Our early history is the study of European germs developing in an American environment. Too exclusive attention has been paid by institutional students to the Germanic origins, too little to the American factors. The frontier is the line of most rapid and effective Americanization. The wilderness masters the colonist. It finds him a European in dress, industries, tools, modes of travel, and thought. It takes him from the railroad car and puts him in the birch canoe. It strips off the garments of civilization and arrays him in the hunting shirt and the moccasin. It puts him in the log cabin of the Cherokee and Iroquois and runs an Indian palisade around him. Before long he has gone to planting Indian corn and plowing with a sharp stick; he shouts the war cry and takes the scalp in orthodox Indian fashion. In short, at the frontier the environment is at first too strong for the man. He must accept the conditions which it furnishes, or perish, and so he fits himself into the Indian clearings and follows the Indian trails. Little by little he transforms the wilderness, but the outcome is not the old Europe, not simply the development of Germanic germs, any more than the first phenomenon was a case of reversion to the Germanic mark. The fact is, that here is a new product that is American. At first, the frontier was the Atlantic coast. It was the frontier of Europe in a very real sense. Moving westward, the frontier became more and more American. As successive terminal moraines result from successive glaciations, so each frontier leaves its traces behind it, and when it becomes a settled area the region still partakes of the frontier characteristics. Thus the advance of the frontier has meant a steady movement away from the influence of Europe, a steady growth of independence on American lines. And to study this advance, the men who grew up under these conditions, and the political, economic, and social results of it, is to study the really American part of our history.

In the course of the seventeenth century the frontier was advanced up the Atlantic river courses, just beyond the "fall line," and the tidewater region became the settled area. In the first half of the eighteenth century another advance occurred. Traders followed the Delaware and Shawnese Indians to the Ohio as early as the end of the first quarter of the century.[5:1] Gov. Spotswood, of Virginia, made an expedition in 1714 across the Blue Ridge. The end of the first quarter of the century saw the advance of the Scotch-Irish and the Palatine Germans up the Shenandoah Valley into the western part of Virginia, and along the Piedmont region of the Carolinas.[5:2] The Germans in New York pushed the frontier of settlement up the Mohawk to German Flats.[5:3] In Pennsylvania the town of Bedford indicates the line of settlement. Settlements soon began on the New River, or the Great Kanawha, and on the sources of the Yadkin and French Broad.[5:4] The King attempted to arrest the advance by his proclamation of 1763,[5:5] forbidding settlements beyond the sources of the rivers flowing into the Atlantic; but in vain. In the period of the Revolution the frontier crossed the Alleghanies into Kentucky and Tennessee, and the upper waters of the Ohio were settled.[5:6] When the first census was taken in 1790, the continuous settled area was bounded by a line which ran near the coast of Maine, and included New England except a portion of Vermont and New Hampshire, New York along the Hudson and up the Mohawk about Schenectady, eastern and southern Pennsylvania, Virginia well across the Shenandoah Valley, and the Carolinas and eastern Georgia.[6:1] Beyond this region of continuous settlement were the small settled areas of Kentucky and Tennessee, and the Ohio, with the mountains intervening between them and the Atlantic area, thus giving a new and important character to the frontier. The isolation of the region increased its peculiarly American tendencies, and the need of transportation facilities to connect it with the East called out important schemes of internal improvement, which will be noted farther on. The "West," as a self-conscious section, began to evolve.

From decade to decade distinct advances of the frontier occurred. By the census of 1820[6:2] the settled area included Ohio, southern Indiana and Illinois, southeastern Missouri, and about one-half of Louisiana. This settled area had surrounded Indian areas, and the management of these tribes became an object of political concern. The frontier region of the time lay along the Great Lakes, where Astor's American Fur Company operated in the Indian trade,[6:3] and beyond the Mississippi, where Indian traders extended their activity even to the Rocky Mountains; Florida also furnished frontier conditions. The Mississippi River region was the scene of typical frontier settlements.[7:1]

The rising steam navigation[7:2] on western waters, the opening of the Erie Canal, and the westward extension of cotton[7:3] culture added five frontier states to the Union in this period. Grund, writing in 1836, declares: "It appears then that the universal disposition of Americans to emigrate to the western wilderness, in order to enlarge their dominion over inanimate nature, is the actual result of an expansive power which is inherent in them, and which by continually agitating all classes of society is constantly throwing a large portion of the whole population on the extreme confines of the State, in order to gain space for its development. Hardly is a new State or Territory formed before the same principle manifests itself again and gives rise to a further emigration; and so is it destined to go on until a physical barrier must finally obstruct its progress."[7:4]

In the middle of this century the line indicated by the present eastern boundary of Indian Territory, Nebraska, and Kansas marked the frontier of the Indian country.[8:1] Minnesota and Wisconsin still exhibited frontier conditions,[8:2] but the distinctive frontier of the period is found in California, where the gold discoveries had sent a sudden tide of adventurous miners, and in Oregon, and the settlements in Utah.[8:3] As the frontier had leaped over the Alleghanies, so now it skipped the Great Plains and the Rocky Mountains; and in the same way that the advance of the frontiersmen beyond the Alleghanies had caused the rise of important questions of transportation and internal improvement, so now the settlers beyond the Rocky Mountains needed means of communication with the East, and in the furnishing of these arose the settlement of the Great Plains and the development of still another kind of frontier life. Railroads, fostered by land grants, sent an increasing tide of immigrants into the Far West. The United States Army fought a series of Indian wars in Minnesota, Dakota, and the Indian Territory.

By 1880 the settled area had been pushed into northern Michigan, Wisconsin, and Minnesota, along Dakota rivers, and in the Black Hills region, and was ascending the rivers of Kansas and Nebraska. The development of mines in Colorado had drawn isolated frontier settlements into that region, and Montana and Idaho were receiving settlers. The frontier was found in these mining camps and the ranches of the Great Plains. The superintendent of the census for 1890 reports, as previously stated, that the settlements of the West lie so scattered over the region that there can no longer be said to be a frontier line.

In these successive frontiers we find natural boundary lines which have served to mark and to affect the characteristics of the frontiers, namely: the "fall line;" the Alleghany Mountains; the Mississippi; the Missouri where its direction approximates north and south; the line of the arid lands, approximately the ninety-ninth meridian; and the Rocky Mountains. The fall line marked the frontier of the seventeenth century; the Alleghanies that of the eighteenth; the Mississippi that of the first quarter of the nineteenth; the Missouri that of the middle of this century (omitting the California movement); and the belt of the Rocky Mountains and the arid tract, the present frontier. Each was won by a series of Indian wars.

At the Atlantic frontier one can study the germs of processes repeated at each successive frontier. We have the complex European life sharply precipitated by the wilderness into the simplicity of primitive conditions. The first frontier had to meet its Indian question, its question of the disposition of the public domain, of the means of intercourse with older settlements, of the extension of political organization, of religious and educational activity. And the settlement of these and similar questions for one frontier served as a guide for the next. The American student needs not to go to the "prim little townships of Sleswick" for illustrations of the law of continuity and development. For example, he may study the origin of our land policies in the colonial land policy; he may see how the system grew by adapting the statutes to the customs of the successive frontiers.[10:1] He may see how the mining experience in the lead regions of Wisconsin, Illinois, and Iowa was applied to the mining laws of the Sierras,[10:2] and how our Indian policy has been a series of experimentations on successive frontiers. Each tier of new States has found in the older ones material for its constitutions.[10:3] Each frontier has made similar contributions to American character, as will be discussed farther on.