Which of the following  people steel become a major industry in the united states1 thomas edison2 alexander graham bell3 lewis latimer4 andrew carnegie

Andrew Carnegie. He helped steel become a major industry in the United States.
He led to the expansion of America steel industry. He was among the richest people in America. He was the leading philanthropist in the United States and all over British Empire.
He started work as a telegrapher and 1860s he had investments in rail board, bridges, oil derricks, and rail board sleeping cars.