US Population Dynamics and Spatial Shifts
Mobility in the U.S. Population: Characterized by great spatial mobility. People move to places with new job opportunities or more favorable environmental conditions. U.S. population displacement occurs at the state, city, and neighborhood levels. It is estimated that the average family changes residence every 5 years, a trend more intense in higher-income sectors. Population mobility is associated with social mobility and the American lifestyle; a change in social status is often accompanied by a change of neighborhood, materializing social advancement.
Distribution of the American Population
Changes in population dynamics correlate with the spatial distribution across the continent. Four processes can be identified:
- Concentration and Deepening Imbalances: The population tended to locate in already occupied areas.
- Increasing Urbanization: Migration processes from rural areas were the main cause of accelerated urban expansion.
- Metropolization: Explosive growth of major cities, leading to the formation of metropolises.
- Occupation of Empty Areas: Due to communication infrastructure and population spread to colonization fronts, such as the Amazon basin, Orinoco, and Central American regions.
North America: Urbanization and Megalopolis
More than 35% of Americans live in megalopolises. These form when cities expand and merge with other metropolises, creating a continuous urban space. In the U.S., there is the Atlantic Megalopolis and the Great Lakes Megalopolis. The California Megalopolis lies between San Francisco, Los Angeles, and San Diego. In Canada, 90% of the population is concentrated in a strip extending 300km along the U.S. border, covering the region from the Great Lakes to the Gulf of St. Lawrence.
Working in America
When studying the American population, it is difficult to explain demographic processes without considering the occupational structure, working conditions, and employment. This necessitates relating these factors to other economic and social issues, such as economic structure, technology, education, and population living conditions. The relationships between these elements are complex and show differentials between countries in the Americas.
The Indicators of Human Development
The United Nations Development Program (UNDP) attempts to use an index that allows for measuring quality of life. The Human Development Index (HDI) has been proposed, composed of three indicators: life expectancy, educational attainment, and gross domestic product. This index allows tracking progress in each country over many years, indicating advancements in life expectancy and access to education for all.