Beginning on May 18th, 2045, culminating with the last event of the Great Grieving on May 18th, 2135, and truly ending in 2142, this 97 year period of human history began with a personal tragedy, and ended with tragedy writ large upon all of humanity. In between humanity transformed from a single-planet species just beginning to colonize their own moon, to a species stretched across two worlds, two planet-sized moons, and countless asteroids.
A time of great change, immense opportunity, and the return to terrible tyranny and stark disparity, it was both noble and mean, great and terrible, joyful and tragic. Perhaps that, indeed, is its seminal character, a time of opposition.