If you're to go by mentioning of names then you may at long-run get it wrong because everyone has his good and bad side, we cannot assume leaders from US as the only ones that can be influential because US is one of the leading countries in the world or because of it popularity and vigor in world economy and commerce, any country or it's leaders who have the minds of the people at hand, who has good and positive conscience and ready to lead and not to rule is an influential leader to me because they have served the world with a good example.
did you know when USA was leaving Afghanistan - the whole world was talking about
There are many influential leaders in the world apart from Bush and Biden