Final answer:
The U.S. president being both head of state and chief executive makes them different from many other world leaders.
Step-by-step explanation:
The fact that the U.S. president is both head of state and chief executive sets them apart from many other world leaders. In most countries, these roles are split between different individuals or offices. For example, in countries with a parliamentary system like the United Kingdom, the monarch serves as the head of state while the prime minister serves as the chief executive. Having a single individual holding both roles in the United States gives the president significant power and influence.
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