What factors led to a population boom in northeastern cities?

The population boom in northeastern cities during the 19th and early 20th centuries was driven by several factors, including industrialization, which created numerous job opportunities that attracted rural populations and immigrants. The availability of transportation infrastructure, such as railroads and canals, facilitated migration and trade. Additionally, the promise of better living standards and social mobility in urban areas drew people from both domestic and international origins, contributing to rapid urban growth. Lastly, the influx of immigrants, particularly from Europe, significantly bolstered the urban workforce and diversified city populations.