There isn't enough context provided to determine the specific nature of the U.S. expansion being referred to. U.S. expansion can refer to various historical events such as the westward expansion during the 19th century, the acquisition of new territories through diplomacy or military action, or the economic expansion of U.S. businesses overseas. Please provide more information for a more accurate answer.
At what time are you referring to when you mention U.S. expansion? The United States' expansion can be examined during different periods in history, such as westward expansion during the 19th century or overseas expansion in the late 19th and early 20th centuries. If you can provide more specific information or a time frame, I can give you a more detailed answer.
