Narrative and Critical History of America, Vol. 4 (of 8) / French Explorations and Settlements in North America and Those of the Portuguese, Dutch, and Swedes 1500-1700

by Unknown

Nearly the whole of North America that is within the limits of the United States receives some share of frost. This secures it against the permanent occupation of contagious fevers, which from time to time find their way to it from the tropics.

North America, east of the 100th meridian (west of Greenwich) and north of thirty-five degrees, has a soil which is on the whole superior to that of Europe. Practically the whole of this vast area is tillable, and the variety of crops is very great, considerably greater than that of Europe. West of the 100th meridian the rainfall diminishes rapidly, being especially limited in the summer season. The winters become longer and more extreme throughout all the region within or under the climatic influence of the Cordilleras; the soil is thinner, and over vast regions almost wanting. In certain exceptional tracts as far westward as the Saskatchewan, and at points along the line between the United States and Canada to the south of that valley, there are considerable areas of good soil; but, considered in a general way, we may exclude all the region between the 100th meridian and the Sierra Nevada range from the hope of any great agricultural future. Even should the rainfall be increased by tree-planting in those regions where trees may grow, the quality of the soil in this district, even where soil exists, is often too poor for any use. Yet in some parts it is very good, and if tree-planting should increase the rainfall, some limited areas will be tillable.

Next to the quality of the soil, the forest covering of a country does the most to determine its uses to man. Although the Western prairies have the temporary advantage that they are more readily brought under cultivation than wooded regions, the forests of a land contribute so largely to man’s well-being, that without them he can hardly maintain the structure of his civilization. The distribution of American forests is peculiar. All the Appalachian mountain system and the shore region between that system and the sea, as well as the Gulf border as far west as the Mississippi, were originally covered by the finest forest that has existed in the historical period, outside of the tropics. In the highlands south of Pennsylvania and in the western table-land north to the Great Lakes, this forest was generally of hard-wood or deciduous trees; on the shore-land and north of Pennsylvania in the highlands, the pines and other conifers held a larger share of the surface. The parts of the land bordering the Mississippi on the west, as far as the central regions of Louisiana, Arkansas, and Missouri, are forest clad. Michigan and portions of Wisconsin and Minnesota have broad areas of forests, but the cis-Mississippian States of Indiana and Illinois, and the trans-Mississippian country west to the Sierra Nevada, is only wooded, and that generally scantily, along the borders of the streams. Data for precise statements are yet wanting, but there is no doubt that this area is untimbered over about seven eighths of its surface, and the wood which exists has a relatively small value for constructive purposes. North of the regions described, except along the Pacific coast, where fine soft-wood forests extend from near San Francisco to Alaska, the forest growth rapidly diminishes in size, and therefore in value, the trees becoming short and gnarled, and the kinds of wood inferior. So that the region north of the St. Lawrence and of the Great Lakes is not to be regarded as having any very great value from the forest resources it affords. In estimating the value of North America to man, the limitation of good forests to the region east of the Mississippi must be regarded as a disadvantage which is likely to become more serious with the advance of time. Undoubtedly the timberless character of the prairie country for at least two hundred miles west of the Mississippi is in the main due to the constant burning over of the surface by the aborigines. It seems possible that these regions may yet be made to bear extensive woods. The elevated plains that lie farther to the west seem to have too little rainfall for the support of forests.

The rivers of a country are a result and a measure of its climate. The generally large rainfall of the eastern half of North America is shown by the number and size of its streams, which, area for area, are longer and more frequent than those of the Old World, except on the eastern coast of Asia. The heaviest rainfall and the greatest average of streams is found about the Gulf of Mexico and the southern part of the Appalachian district. Hence, northerly, westerly, and northwesterly, the rainfall decreases in amount. The average of the region east of the Mississippi and south of the Laurentian Mountains is probably about fifty inches per annum, somewhere near one-third more than that of Europe. North America, despite the very dry district of the Cordilleras, has an average rainfall about as great as that of Europe, and probably rather greater than Asia; indeed its water-supply is rather greater than the average for lands situated so far from the equator.

The rivers of America have been of very great importance in the settlement of the land. They afford more navigable waters than all the streams of Asia put together. Without the system of the Mississippi, which has more navigable waters than any river except the Amazons, it would not have been possible for America to have been brought under the control of colonies with such speed.

The elevation of the surface of North America, at least of its more habitable portions, is very favorable to man. A large part of its fertile soils lie from five hundred to fifteen hundred feet above the sea. It has a larger part of its surface within the limits of height that are best suited to the uses of man than Asia, but less than Europe has.

In considering the fitness of this continent for the use of European races, it will not do to overlook the mineral resources of the country. It may be stated in general terms that North America is richer in the mineral substances which have most contributed to the development of man than any other continent. The precious metals may be briefly dismissed. They occur constantly in two areas: the Cordilleran,—which, from Mexico, California, Nevada, New Mexico, and Colorado, has doubtless furnished more gold and silver than any other one mountain district,—and the Appalachian region, which has given about sixty million dollars to the world’s store of gold. The precious mineral resources of the Cordilleran region are probably greater than those of any other continent. They have already exercised a very great influence on the commercial and political history of the continent, and are likely to become of more importance as time goes on, for at least half a century to come.

In the so-called baser, yet really more precious, metals this continent is even more fortunate. The supplies in the most important metal, iron, are very great,—certainly greater than in Europe. This metal is distributed with much uniformity over the country, there being scarcely a State except Florida that cannot claim some share of this metal. Especially rich in deposits of this metal are the States which share the Appalachian district, and the States of Missouri and Michigan. The Rocky Mountains also abound in iron ores, which there often contain a certain proportion of the precious metals; so that it is possible that the exploitation of the two metals may in time be carried on there together. There is probably no other continent that contains as large a share of iron,—the most important metal for the uses of man.