Final answer:
The development of A. irrigation systems, such as dams, played a significant role in increasing agriculture during the western expansion. Irrigation allowed previously arid land to be watered, opening up millions of acres for farming and contributing to increased crop yields.
Step-by-step explanation:
The correct answer is A. irrigation from dams. The development of irrigation systems, such as dams and aquifers, played a significant role in increasing agriculture during the western expansion. These systems allowed previously arid land to be watered, opening up millions of acres for farming. By providing water to crops, irrigation contributed to increased crop yields and the ability to grow a variety of foods in arid regions.
For example, in regions like California's Great Central Valley, where irrigation is extensively used, farmers are able to grow an enormous variety of foods and achieve profitable farming outcomes. Irrigation systems, such as canals, pumping facilities, and water storage facilities, have made it possible to cultivate crops in areas that would otherwise be too dry for most crops.
The government played a role in facilitating the growth of irrigation techniques by investing taxpayer funds in the construction of dams, canals, and other infrastructure. These developments not only supported agriculture but also contributed to the rapid growth of industry and cities in the western regions.