Answer:
Changes in urban-rural population: The United States has seen a significant shift in population from rural to urban areas over the past century. According to the US Census Bureau, in 1920, only 51% of the population lived in urban areas, compared to over 82% in 2020. This trend has been driven by factors such as industrialization, job opportunities, and lifestyle preferences.
Patterns of migration: The United States has a long history of migration, with different waves of immigrants arriving at different times in the country's history. In the 19th and early 20th centuries, immigrants from Europe and Asia were the primary drivers of migration, while in the mid-20th century, the Great Migration saw millions of African Americans move from the South to Northern and Western cities. More recently, immigration from Latin America and Asia has increased.
Population density: The United States has a relatively low population density compared to many other countries, with an average of 93 people per square mile. However, population density varies widely across the country, with some areas, such as New York City, having a population density of over 27,000 people per square mile, while others, such as Alaska, have a population density of less than one person per square mile. Factors that influence population density include geography, climate, and economic opportunities.