Final answer:
The period from 1911 to 1920 was marked by World War I and its aftermath, which brought political, cultural, and economic changes globally.
Step-by-step explanation:
In the period from 1911 to 1920, there were significant events and changes taking place globally. One major event during this time was World War I, which had a profound impact on Europe and the rest of the world. The war resulted in the dismantling of monarchies and nobility, paving the way for republican democracies. Additionally, the aftermath of the war led to a cultural and intellectual boom, despite economic struggles. It is important to note that this period was not just a prequel to World War II, but a time of significant transformation.