The total deposits in all national banks have more than trebled in the present decade; the money in circulation has doubled since 1890. The flood of gold makes it difficult to gage the full meaning of the incredible increase in values, for in the decade ending with 1909 over 41,600,000 ounces of gold were mined in the United States alone. Over four million ounces have been produced every year since 1905, whereas between 1880 and 1894 no year showed a production of two million ounces. As a result of this swelling stream of gold and instruments of credit, aided by a variety of other causes, prices have risen until their height has become one of the most marked features and influential factors in American life, producing social readjustments and contributing effectively to party revolutions. But if we avoid those statistics which require analysis because of the changing standard of value, we still find that the decade occupies an exceptional place in American history. More coal was mined in the United States in the ten years after 1897 than in all the life of the nation before that time.[313:1] Fifty years ago we mined less than fifteen million long tons of coal. In 1907 we mined nearly 429,000,000. At the present rate it is estimated that the supply of coal would be exhausted at a date no farther in the future than the formation of the constitution is in the past. Iron and coal are the measures of industrial power. The nation has produced three times as much iron ore in the past two decades as in all its previous history; the production of the past ten years was more than double that of the prior decade. Pig-iron production is admitted to be an excellent barometer of manufacture and of transportation. Never until 1898 had this reached an annual total of ten million long tons. But in the five years beginning with 1904 it averaged over twice that. By 1907 the United States had surpassed Great Britain, Germany, and France combined in the production of pig-iron and steel together, and in the same decade a single great corporation has established its domination over the iron mines and steel manufacture of the United States. It is more than a mere accident that the United States Steel Corporation with its stocks and bonds aggregating $1,400,000,000 was organized at the beginning of the present decade. The former wilderness about Lake Superior has, principally in the past two decades, established its position as overwhelmingly the preponderant source of iron ore, present and prospective, in the United States--a treasury from which Pittsburgh has drawn wealth and extended its unparalleled industrial empire in these years. The tremendous energies thus liberated at this center of industrial power in the United States revolutionized methods of manufacture in general, and in many indirect ways profoundly influenced the life of the nation.