This document summarizes key developments during the New Industrial Age from 1877-1900. It describes the expansion of industry through abundant natural resources and inventions like steel production and the Bessemer Process. The growth of railroads linked the country and opened new markets and economic opportunities. Big businesses emerged, with owners like Andrew Carnegie and John D. Rockefeller using monopolistic practices to dominate their industries. This period also saw the rise of labor unions advocating for better pay, shorter hours, and safer working conditions against the laissez-faire attitudes of business owners.