Beyond the fact that they have almost nothing in common?
I'm probably grasping at straws here but during the 20s and 30s its inability to handle its fiscal dilemmas properly, the alarmist media, the polarization, the hold-up of necessary reforms by the conservative senate and the like are reminiscent of many American problems. I think it holds up much better than the often recited "Weimar = 21st century America" comparison.
Why do you think I'm entirely off-base here?