Answer: The correct option among the given choices is: The United States became a world power.
American expansionism, particularly during the late 19th and early 20th centuries, played a significant role in transforming the United States into a global power. Through expansionist policies such as the annexation of new territories and overseas acquisitions, the United States extended its influence and presence beyond its continental borders. Notable examples include the acquisition of territories such as Alaska, Hawaii, Puerto Rico, Guam, and the Philippines.
These expansionist endeavors brought the United States into closer engagement with global affairs, both politically and economically. The United States emerged as a major player in international politics and began to exert its influence on a global scale. This newfound status as a world power helped shape the United States' foreign policy, military strategies, and its overall role on the world stage.