Which robber baron was born the son of poor immigrants and became one of the richest people in the world by creating a steel monopoly

The statement refers to Andrew Carnegie, who was the son of poor Scotish immigrants and became one of the richest people in the world by creating a steel monopoly.

Explanation:

Andrew Carnegie was an American industrialist, businessman and philanthropist born in Scotland. As a child, he emigrated from Scotland with his parents. He worked from a very young age on the Pennsylvania Railroad Company. At age 20 he became manager of the same railroad company and the apprentice of Thomas A. Scott, owner of the company. He created the Carnegie Steel Company in Pittsburgh, which later merged with the Federal Steel Company of Elbert H. Gary and with several smaller companies to create U.S. Steel. The fortune he earned from his businesses was spent on philanthropy and education, founding the Carnegie Corporation of New York, the Carnegie Endowment for International Peace, and Carnegie Mellon University in Pittsburgh.

c) troops march forward in close formation against newer, more accurate weapons

the section of the chart that represents a point at which a bill needs approval from a majority of people in both chambers to advance is j, as this is the only section before the bill becomes law which has both rows (symbolizing the chambers) converging into one, meaning that the two parts of the congress have to approve of it before it can march on with the process.