For what geographic reasons is the western half of the United States more sparsely populated than the eastern half?

People tend to live on land that is reasonably flat and where crops can be easily grown.

What kind of landforms do we find in the west?

http://en.wikipedia.org/wiki/List_of_North_American_deserts

The western half of the United States is more sparsely populated than the eastern half due to several geographic reasons:

1. Mountainous Terrain: The western region of the United States is characterized by diverse mountain ranges such as the Rockies, Sierra Nevada, and the Cascade Range. These mountainous terrains make it more difficult for settlement and agricultural activities due to steep slopes, limited flat land, and inaccessible areas. The rugged landscape creates challenges for transportation, infrastructure development, and resource accessibility, which hampers population growth and density.

2. Arid and Semi-arid Climate: Large parts of the western United States, particularly in states like Nevada, Arizona, and New Mexico, experience arid and semi-arid climates. These regions have limited water resources, with low precipitation and high evaporation rates. The lack of reliable water sources makes it difficult for agriculture and human habitation, limiting population concentrations and overall density.

3. Limited Water Supply: The western half of the United States is characterized by a scarcity of freshwater resources compared to the eastern half. The arid landscapes and limited rainfall contribute to diminished water availability, particularly in desert regions like the Mojave and Sonoran Deserts. Consequently, water scarcity poses a constraint on sustaining larger populations and agricultural development in these areas.

4. Distance from Major Metropolitan Areas: The western half of the United States is generally farther away from major metropolitan areas, making it less attractive for settlement and economic development. Historically, cities on the east coast, such as New York City, Boston, and Philadelphia, were established earlier and became major economic centers, attracting population growth and fostering urbanization. This population momentum and economic development in the east have contributed to the relative denser population compared to the west.

5. Historical Settlement Patterns: Settlement patterns and the availability of resources have shaped the population distribution over time. The eastern part of the United States experienced early colonization and greater ease of transportation through rivers and coastal areas, which facilitated settlement and economic growth. In contrast, the west was explored and settled later, with a focus on resource extraction such as mining and logging, rather than widespread agricultural settlement.

Exploring these geographic factors helps us understand why the western half of the United States is more sparsely populated compared to the eastern half.