One must be cautious with this line of questioning. The parallels are always incomplete, and what might seem like peripheral details are likely important nuances. There have never been conditions in American history identical to the ones we live in today. In that sense, every era is a "historical snowflake."

That is not, of course, to say that we can't learn from the past. We just need to be very cautious in our assertions. I'm also struggling to identify what exactly you'd like to know about: DNC protests about conspiracy, and how they might be paralleled in past times? A significant shift in party platforms? Please clarify this portion.

Also, please be aware that you might run the risk of violating the 20-year rule.