Final answer:
The United States won World War II through a combination of economic strength, international leadership, and aggressive tactics in the Pacific theater.
Step-by-step explanation:
The United States won World War II through a combination of factors. First, the United States emerged from the war with a strong economy due to its ability to export military equipment and consumer goods to the Allied powers. This economic strength allowed the US to maintain dominance in banking and international trade. Second, the United States played a leading role in creating the post-World War II international order, which helped maintain peace and economic prosperity in the world. Finally, the United States fought aggressively in the Pacific theater, using tactics like island hopping and ultimately dropping the atomic bomb on Japan to force their surrender.