Michigan, and Wisconsin are the largest producers. See section on Geographical Distribution, under Mineral Waters.
Miscellaneous. A moderate value of asphaltic products is realized each year. These consist of bituminous sandstones, asphaltic limestones, asphaltum, and gilsonite, from California, Kentucky, Indian Territory, Texas, and Utah. Peat is not worked to any important degree, but forms a not inconsiderable reserve of fuel in some Northern States. Slate is extensively produced in Vermont and Pennsylvania. Graphite occurs in the Champlain region of New York, also in Pennsylvania, Georgia, and Alabama. Among other important products are abrasives, borax, pyrite, mineral paints, talc, soapstone, and manganese ore. Almost all the minerals and metals used in the arts are produced, and in quantities sufficient to meet the needs of the home markets. Tin, antimony, platinum, nickel, sulphur, and gems and precious stones are the articles most largely imported.
Agriculture. The United States produces a larger value of agricultural products than any other country. Until the last quarter of the nineteenth century agriculture strongly predominated in the industrial life of the nation. It still employs a much greater number of individuals than any other industry. Owing to the vast area and great variety of physical and climatic conditions, most of the staple products known to the world can be raised. The agricultural development of the United States has had an immense influence on the progress of the world—not only by revolutionizing the system of farm machinery, but by adding to the European food supply and making possible a more rapid growth of population. With respect to the country's adaptability to agriculture, the most prominent features are: First, the preëminence of the Mississippi Valley for agricultural purposes; and, second, the vast waste areas to the west which are but little suited to tillage. If to the arable portion of the Mississippi drainage basin be added the area drained into the Gulf of Mexico by other streams, it would include about one-third of the total area of the United States. In this division, almost unbroken by mountain or swamp area, the soil is generally of great fertility, and probably over four-fifths of the value of the agricultural products may be accredited to this region. The Appalachian and Atlantic seaboard region contains much broken and rocky land, and much soil of only moderate or of inferior quality. Throughout the eastern half of the United States the rainfall is ordinarily sufficient for growth of crops. Westward, however, in the longitude of central Kansas, the rainfall is greatly diminished and the transition from cultivated region to grazing lands is fairly abrupt. The Gulf of Mexico has a decidedly moderating effect on the climate of the Gulf States, particularly Florida. But there is no protection in this region against the cold winds from the north which occasionally sweep southward and bring frosts even to that State. Although much farther south than Southern Europe, the Gulf region is less adapted to the growing of tropical products. The Appalachian Mountains and the Atlantic Ocean together have a somewhat moderating effect upon the Carolina-Virginia region and the region farther north; hence this area has an advantage in the raising of some products, especially fruit, over the region west of the Appalachians. In the north the lakes have a moderating influence, making that territory also favorable for fruit-growing. On the Pacific Coast the ocean breezes and the mountains together afford the most highly protected portion of the United States, and make it unequalled as a fruit region.
Area of Farms and Improved Land. In the following table it will be seen that the total farm area of the United States increased in the last half of the nineteenth century nearly threefold:
Acres of Land in Farms
| CENSUS YEAR | Total | Improved | Unimproved |
| 1850 | 293,560,614 | 113,032,614 | 180,528,000 |
| 1860 | 407,212,538 | 163,110,720 | 244,101,818 |
| 1870 | 407,735,041 | 188,921,099 | 218,813,942 |
| 1880 | 536,081,835 | 284,771,042 | 251,310,793 |
| 1890 | 623,218,619 | 357,616,755 | 265,601,864 |
| 1900 | 841,201,546 | 414,793,191 | 426,408,355 |
The total farm area in the decade 1860-1870 stood practically stationary, but the improved area increased during that period. The large gain made between 1890 and 1900 consisted mainly of unimproved land. This was due mainly to the inclusion in the census of large areas of grazing land throughout the West, particularly Texas, in which State the unimproved area increased from 30,660,722 to 106,230,941 acres. In the North Atlantic States the census shows a considerable decrease since 1880 in the improved area, but this was largely due to a change in census methods, and the real decrease was less than indicated. The improved area in the South Atlantic States has increased constantly since 1870. The following table shows the acreage of improved and unimproved land and the total land area in 1900:
| STATES BY DIVISIONS | Total land area, square miles |
Total improved and unimproved farm area, acres |
Improved farm area, acres |
Unimproved farm area, acres |
| North Atlantic | 162,103 | 65,409,089 | 38,920,614 | 26,488,475 |
| South Atlantic | 268,620 | 104,297,506 | 46,100,226 | 58,197,280 |
| North Central | 753,550 | 317,349,474 | 222,314,099 | 95,035,375 |
| South Central | 610,215 | 257,738,845 | 80,007,867 | 177,730,978 |
| Western | 1,175,742 | 93,796,860 | 27,155,681 | 66,641,179 |
The most noteworthy fact shown is the great importance, absolutely and proportionately, of the north central division. Over one-half the total farm area in this section is improved. There are but few large regions in the world so easily and uniformly adaptable to cultivation. In Iowa 97.4 per cent. of the total land area was in farms in 1900, and of this 86.5 per cent. was improved. Illinois makes almost an equally good showing, and Indiana, Ohio, and Missouri are other States
