I made a history timeline to learn what events happened around the same time

I like that. Though I just skimmed it. What is missing IMO is volcanism, and how the larger eruptions overlap, maybe with a few years delay, with larger wars and epidemics, caused by misharvests. Maybe I've missed that, by only skimming?

The only eruption I have now is Mount Tambora in 1815. I looked at a couple others but wasn't sure how many to include. The effects tend to be regional.