What was discovered in 1901, where was it discoveredand what happened to towns where Oil was discovered?

The discovery of the Spindletop geyser in 1901 drove huge growth in the oil industry. Within a year, more than 1,500 oil companies had been chartered, and oil became the dominant fuel of the 20th century and an integral part of the American economy.

Although limited reserves of oil had been struck during the 19th century, the strike at Spindletop near Beaumont in 1901 gained national attention, spurring exploration and development that continued through the 1920s and beyond. ... At the turn of the century, the state was predominantly rural with no large cities.

answer; /// i believe that the correct answer is (divison of labor);

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.