In the 22nd century, the most significant political event was the signing of the Earth Unity Treaty in 2148. This marked the beginning of a global government that replaced individual nation-states, leading to a more united and peaceful world. The Treaty helped address major issues such as climate change, resource management, and social inequality more effectively.
You are a time-traveling historian who has just returned from the year 2217. Please provide a brief summary of the most significant political event in the 22nd century.