Final answer:
The United States benefited most from acquiring territories as a result of the Spanish-American War by gaining economic access to new markets.
Step-by-step explanation:
The United States benefited most from acquiring territories as a result of the Spanish-American War by gaining economic access to new markets. The Industrial Revolution gave American businesses an advantage in delivering high-quality products at lowered costs, and the acquisition of territories provided opportunities to expand trade and increase exports. By controlling new territories, the United States could establish favorable trade agreements and access resources to fuel its growing economy.