After the , great numbers of European immigrants swelled Pittsburgh’s population, and industrial magnates such as , , and Thomas Mellon built their steel empires there. The city became the focus of historic friction between labour and management, and the was born there in 1881. map of Pittsburgh, c. 1900Map of Pittsburgh (c. 1900), from the 10th edition of Encyclopædia Britannica.(more)By 1900 the city’s population had reached 321,616. Growth continued nearly unabated through , the war years bringing a particularly great boon for the economy. The population crested at more than 675,000 in 1950, after which it steadily declined; by the end of the century, it had returned almost to the 1900 level. Most citizens were still of European ancestry, but the growing African American proportion of the population exceeded one-fourth. During the period of economic and , Pittsburgh had come to epitomize the grimy, polluted industrial city. After the war, however, the city undertook an extensive redevelopment program that emphasized smoke-pollution control, flood prevention, and sewage disposal. In 1957 it became the first American city to generate electricity by . The contemporary city By the late 1970s and early ’80s, the steel industry had virtually disappeared—a result of foreign competition and decreased demand. Many of the surrounding mill towns were laid to waste by , becoming a symbol of the notorious , the U.S. region where steelmaking and once thrived before succumbing to widespread unemployment and . Pittsburgh, however, successfully diversified its economy through more emphasis on light industries—though metalworking, chemicals, and plastics remained important—and on such high-technology industries as computer software, industrial automation (robotics), and biomedical and environmental technologies. Numerous industrial research laboratories were established in the area, and the became increasingly important. Pittsburgh long has been one of the nation’s largest inland ports, and it remains a leading transportation centre. Duquesne UniversityStudent Union, Duquesne University, Pittsburgh.(more)Much of the Golden Triangle has been rebuilt and includes Point State Park (containing Fort Pitt Blockhouse and Fort Pitt Museum), the Gateway Center (site of several skyscrapers and a garden), and the David L. Lawrence Convention Center. The was chartered in 1787. Other educational institutions include (1900), (1878), Point Park (1960), Chatham (1869), and Carlow (1929) universities and two campuses of the Community College of Allegheny County (1966)., Pittsburgh (/ ˈ p ɪ t s b ɜːr ɡ / PITS-burg) is a city in Allegheny County, Pennsylvania, United States, and its county seat. It is the second-most populous city in Pennsylvania (after Philadelphia) and the 67th-most populous city in the U.S., with a population of 302,971 as of the 2020 census., Discover the many things to do in Pittsburgh PA. Enjoy exciting Pittsburgh tourism activities, take in scenic views and eat at award-winning restaurants..