Final answer:
The Spanish-American War resulted in economic benefits for the United States by providing new markets and trade opportunities through the acquisition of territories.
Step-by-step explanation:
The statement that best describes the effect of the Spanish-American War on the U.S. economy is: Territories under United States' control provided the nation economic benefits in terms of trade and new markets for American goods. The war resulted in the annexation of new territories such as Puerto Rico, Guam, and the Philippines, which expanded the U.S. market and provided opportunities for American businesses to trade and sell their products in these regions. This led to an increase in American exports and overall economic growth.
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