unfortunately we are in a new epoch, so the timings will not coincide, nor are things limited to the old cycles.

We will see the breaking apart of The US and China in the near term
We will see the breaking apart of almost all counties in the next century.

Countries are old entities that are no longer needed.
With mass communication, having "officials" be buffers is not needed.

i do not believe Chump will be successfully assassinated.
He is/was a wild card, and like Hitler, will be difficult to kill.

However, most of the democrat party will disappear. My thoughts are Coronavirus hitting all those old geezers, but it could be political.