Final answer:
The great business leaders of the Age of Industry who brought tremendous benefits to mankind were John D. Rockefeller, Andrew Carnegie, and J.P. Morgan. They contributed to technological innovation, job creation, and philanthropy, revolutionizing various industries and fostering urban growth.
Step-by-step explanation:
Name three great business leaders during the Age of Industry and highlight some benefits they, along with other "captains of industry", brought to mankind.
Rockefeller and Carnegie were key players in shaping the industrial economy with Carnegie leading the steel industry and Rockefeller dominating the oil business. Their integration strategies, such as horizontal integration by Rockefeller and innovative business practices, led to vast industrial growth and the expansion of America's infrastructure.
They also pioneered philanthropic efforts that funded public institutions and education. J.P. Morgan, a prominent financier, helped to orchestrate major corporate mergers creating powerhouses like General Electric and US Steel. This era's industrial titans not only pushed technological boundaries but also played a critical role in urbanizing the United States.