Final answer:
The power and responsibility of the presidency has grown due to the increased prominence of the United States on the world stage.
Step-by-step explanation:
One of the reasons that power and responsibility of the presidency has grown is that the United States has increased its prominence on the world stage. As the United States has become a global superpower, the president has taken on a greater role in international affairs and decision-making. This can be seen in areas such as foreign policy, diplomacy, and military actions.
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