" PR was one of a great many factors involved in the rise of Hitler, but keep in mind that the US system also let a president get elected that didn't win the popular vote"
The U.S. President has never been elected by popular vote. Again, for good reason. Feature, not bug.
Modern Germany hasPR via a mixed member proportional (MMP) system -- which, IIRC, was a German innovation when introduced; it doesn't have straight party-list PR, but then the more proportional system for the US proposed upthread isn't party-list PR, either. Proportionality is a (really, continuous valued, not binary) outcome, there are a number of systems for achieving it to a greater or lesser extent.
Modern Germany does not have PR. For good reason.
" PR was one of a great many factors involved in the rise of Hitler, but keep in mind that the US system also let a president get elected that didn't win the popular vote"
The U.S. President has never been elected by popular vote. Again, for good reason. Feature, not bug.