As a German, this whole registered voter thing still puzzles me. It's almost as if un-registeres people are second class citizens. No ballot access, and even that access can be cut off with voter role purges. It took me a while to really wrap my head around the fact that bot every resident is automatically registered. Without party affiliation off course. Just implementing that would go a long way to fix things. Add more polling places, get rid of gerrymandering and make voting day a public holiday and the US would almost be there. Except for that electoral college thing.

Germany is based on the experience of the Nazi's raise to power, one thing Germany got right after WW2 was the German constitution. Stuff like the 5% hurdle to get seats in parliament for example. The US on the other hand still seem to struggle with a system put in place after the civil war to suppress the black vote and satisfy the former confederate states. But I might be wrong.