Final answer:
Gatsby's real name is James Gatz, a detail that illustrates the self-made identity he has created to achieve the American dream during the Jazz Age, reflecting themes of identity and façade in 'The Great Gatsby.'
Step-by-step explanation:
Nick decides to tell us the truth about Gatsby's past. Gatsby's real name is James Gatz. Gatsby's real name is James Gatz, a detail that illustrates the self-made identity he has created to achieve the American dream during the Jazz Age, reflecting themes of identity and façade in 'The Great Gatsby.'
This revelation is key in The Great Gatsby as it underscores the idea that Gatsby has constructed his own identity much like he has built his fortune, representing not just a person but an embodiment of the American dream in the Jazz Age.
Interestingly, this detail also highlights Fitzgerald's exploration of identity and the façade that characters in the novel present to society, which may not match who they truly are inside. The theme resonates with the broader narrative that examines the American upper class and the decay hidden behind the façade of wealth and opulence.