[Markoff]

leading the free world? you really mean US is some leader of free world? in what filed exactly? living standard, healthcare, education, internet, etc? because I fail to see pretty much any positive field in which US would be world leader.

https://www.youtube.com/watch?v=VMqcLUqYqrs

[TeMPOraL]

It's a well-known historical phrase. See: https://en.wikipedia.org/wiki/Free_World#Leader_of_the_Free_....

Whether it is accurate now is another topic, though.

[Markoff]

apparently only Americans use this phrase, for everyone else it sound arrogant