Summary

The New International Encyclopædia…

Mining. Arizona probably contains a larger proportion of ore and mineral-bearing land than any other member of the Union, but the lack of transportation facilities has prevented a normal development of the mining industry. In spite of this difficulty, however, mining has been undergoing a steady growth, and constitutes the most important industry of the Territory. Copper mining, in which Arizona ranks next to Michigan and Montana, is the most important. The Territory produces more than one-fifth of the total output of the United States.
Source: Wikisource

The New International Encyclopædia…

Agriculture. Isolation and aridity have held Arizona in a backward state of development. Railroads and irrigation, however, are overcoming these obstacles. Stock-raising has been heretofore the leading agricultural industry, and the absence of climatic extremes, such as are common to the regions farther north, is very favorable to this industry. In 1900 the neat cattle in the Territory numbered 607,000; sheep, 668,000; horses, 106,000; the first of these doubled in number during the decade, while the two latter increased threefold.
Source: Wikisource

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