Why is it irony of Mr.Gatz's comment about James J. Hill?

Answer 1

This allusion is some what ironic, although Gatsby was a self-made man, he used his wealth to attempt to win Daisy back, not to do great things for the country. It is obvious that Gatz has a much different view of his son's importance than Carraway or possibly even the rest of society.

Answer 2

Mr. Gatz's comment that James J. Hill could "just pick up the phone and get the President on the line" is ironic because it highlights the stark contrast between Hill's power and Gatz's own humble background and aspirations. Gatz, as a poor farmer's son turned bootlegger, represents the American Dream in its pursuit of wealth and success through hard work, whereas Hill's elite status and connections showcase the reality of wealth and privilege in society.