. History and government of Pennsylvania. A supplement to Elementary American history and government by James Albert Woodburn and Thomas Francis Moran . of view the chief importance of these industries is the effect they have had on the development, industrially and socially, of the state. The population is largely centered in the industrial regions adjacent to the coal fields, and much of the social disorder in the state has come from the struggles of the workers to improve wages and the conditions of labor. Oil. Petroleum or rock oil had long been known to the In-dians, who had obtained it f
. History and government of Pennsylvania. A supplement to Elementary American history and government by James Albert Woodburn and Thomas Francis Moran . of view the chief importance of these industries is the effect they have had on the development, industrially and socially, of the state. The population is largely centered in the industrial regions adjacent to the coal fields, and much of the social disorder in the state has come from the struggles of the workers to improve wages and the conditions of labor. Oil. Petroleum or rock oil had long been known to the In-dians, who had obtained it from certain springs and used it as a medicine. In 1859, a mannamed Drake drilled thefirst oil well, and soonPennsylvania was produc-ing millions of barrels ofoil a year. In time thesupply diminished andricher fields were dis-covered in western gas, associatedwith the oil, was discov-ered later, and gave risein particular to the plateglass industry in Pitts-burgh. Two thirds of the plate glass produced by this countryis made in Pennsylvania. The oil district is in the north-western part of the state and much of the population there. Oil Derricks at McDonald,Pennsylvania Each derrick is directly over an oil well. 36 ELEMENTARY HISTORY AND GOVERNMENT
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