system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can France implement a new president in a matter of days when transition in the U.S. takes months?

Here in the U.S., transition is a huge deal, cabinet members need appointing, etc., but Emmanuel Macron just won an election and within days he was the active president. How is a transition like that managed so quickly?
gpt
For one thing, the two jobs aren't exactly comparable: France has a semi-presidential system, with a President and a Prime Minister. The Prime Minister is the one that does most of the day-to-day stuff and is responsible for recommending cabinet ministers to the President.

In the US, both of those jobs are combined into one office, so the American president has a lot more on his plate.

Also, the Constitution says that Jan 20 is the inauguration day. There simply isn't much interest in changing that, though it probably could be moved up without issue.