In the context of U. S. history, what does Westward Expansion mean?

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."

Explanation:

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane

the correct answer is d