Final answer:
Statement 3, which discusses the expansion of U.S. commercial trade due to the acquisition of new territories, accurately reflects the economic impact of the Spanish-American War on the United States.
Step-by-step explanation:
The most likely statement to be found in a history of the economic impact of the Spanish-American War on the United States is Statement 3: The acquisition of new territories allowed for the expansion of U.S. commercial trade. This statement is supported by the historical context in which the United States gained territories in the Caribbean and Pacific, leading to an expansion in trade and the implementation of an open door policy with China. An example of this can be seen in the United States' acquisition of the Philippines. After the war, the United States gained control of the Philippines, which provided new opportunities for trade in the Pacific region. The United States used its economic clout and industrial capabilities to establish trade networks and increase its economic influence in these newly acquired territories.Through such expansions, the United States increased its global influence and further developed its economy after the Spanish-American War, becoming a recognized world power.