The correct answer to how the United States' emergence as a global leader after the World Wars impacted the executive branch is:
• The Department of Defense was created.
The Department of Defense (DoD) was established in 1947 as a response to the need for a unified military command structure during the Cold War, reflecting the increased global military responsibilities of the U.S. following the World Wars. This reorganization demonstrated a significant shift in how the U.S. managed its defense and foreign policy, enhancing the power and role of the executive branch in these areas.