Write a summary about the westward expansion.

Westward expansion, the 19th-century movement of settlers into the American West, began with the Louisiana Purchase and was fueled by the Gold Rush, the Oregon Trail and a belief in "manifest destiny." A variety of factors contributed to Westward Expansion, including population growth and economic opportunities on what was presented to be available land. Manifest Destiny was the belief that it was settlers' God-given duty and right to settle the North American continent.

the answer is a. since they were a huge producer of cotton and wanted the most money for it.