> On the other hand, multi-party systems have a tendency to build less stable governments,
That's the popular myth, based largely on a combination of conflation of parliamentary and multiparty systems (the two have no essential connection) and the fact that parliamentary systems tend to use different language around a government/administration than presidential systems do.
Measured by either cabinet or head of government turnover rates, multiparty parliamentary systems among established democracies are more stable than the US.
> which was one of the reasons for the downfall of the Weimacher Republik and the rise of the NSDAP.
Two party systems have at least as much problem (really, more) forming moderate-to-opposing extreme coalitions against extremists from one side, which is how extremists of the Right have progressively hijacked a major party in the US, with nothing like the level of externally-imposed stress that produced the NSDAP in Germany. [0] At least in a multiparty system, forming a coalition across tribal identity boundaries formed by party labels is expected.
That's the popular myth, based largely on a combination of conflation of parliamentary and multiparty systems (the two have no essential connection) and the fact that parliamentary systems tend to use different language around a government/administration than presidential systems do.
Measured by either cabinet or head of government turnover rates, multiparty parliamentary systems among established democracies are more stable than the US.
> which was one of the reasons for the downfall of the Weimacher Republik and the rise of the NSDAP.
Two party systems have at least as much problem (really, more) forming moderate-to-opposing extreme coalitions against extremists from one side, which is how extremists of the Right have progressively hijacked a major party in the US, with nothing like the level of externally-imposed stress that produced the NSDAP in Germany. [0] At least in a multiparty system, forming a coalition across tribal identity boundaries formed by party labels is expected.
[0] see, https://www.economist.com/graphic-detail/2020/10/31/the-repu...