State Population Density: How crowded is each state on average, measured by number of residents per square mile. Area Codes: The telephone area codes for each state. Top 5 Cities (2020 population): The top 5 cities for each state, based on 2020 US Census data. Government...
The late 19th and early 20th centuries saw significant industrial growth, with advances in technology and transportation, such as the transcontinental railroad. This period also saw a large influx of immigrants from Europe, Asia, and Latin America, contributing to the rapid urbanization of cities. S...