The Spanish-American War helped the United States become a strong leader in the Americas by securing territories and establishing U.S. dominance in the region. The war marked a shift towards an imperial stance and influenced American foreign policy significantly. Therefore, the correct option is A.
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The Spanish-American War enabled the United States to emerge as a strong leader in the Americas by acquiring territories and establishing dominance in the region. This conflict shifted the U.S. into an imperial role and facilitated increased trade, countering European powers in the Americas. Ultimately, it laid the groundwork for a more interventionist U.S. foreign policy. ;