The document discusses the rise of big business in the United States during the late 19th century. Industrial leaders like Carnegie and Rockefeller amassed huge fortunes through practices like vertical integration and questionable tactics. They justified this inequality through the ideas of Social Darwinism and the Gospel of Wealth. Workers faced increasingly difficult conditions, striking in events like the Great Railroad Strike of 1877 and the Homestead Strike of 1892 to demand better treatment and rights.