Hi Saphi,
It's nice to meet you!
Golden period pre WW1 = belle epoque
Encarta dictionary definition:
belle epoque - An era of cultural refinement, social elegance, and general prosperity and security, especially the last decades of the 19th century and the early years of the 20th prior to World War 1.
[Mid-20th century <French, "fine period"]
Hope this helps you Saphi. Good luck in the competition!
Regards, Butterfly