1. The rise of Adolf Hitler: Though not widely recognized at the time, Adolf Hitler was elected leader of the Nazi Party in Munich on July 29, 1922. This marked the beginning of his political ascension, which would ultimately lead to World War II.
2. The Irish Free State is established: Following the Irish War of Independence, the Anglo-Irish Treaty was signed in December 1921, creating the Irish Free State. While the country remained within the British Commonwealth, the Free State marked a major step towards Irish independence.
3. The discovery of King Tut's tomb: British archaeologist Howard Carter unearthed the tomb of Tutankhamun in November 1922. This monumental discovery captivated the world and brought ancient Egypt back into the public consciousness.
These events, while not directly impacting the story of "The Great Gatsby," provide a historical backdrop to the novel's themes of societal change, wealth, and disillusionment in the post-war era.