It’s always interesting to watch American coverage of British politics, if just because there’s always this tendency to try to find parallels between what’s happening in the two country despite the fact that the two of them have very different political systems.
Whereas only one President has ever resigned from office, it’s actually a fairly common occurrence for the Prime Minister to step down as the leader of their party. The thing that makes Boris Johnson unique is that he stepped down more due to scandal than to anger over his policies.
In the US, saying that a government has fallen leads to images of violent revolution and military-style coups. In most parliamentary countries, saying the government has fallen just means that the Prime Minister has resigned and now, a new one has to be selected.
Occasionally, you do hear that the U.S. would be better off if it had adopted a Parliamentary system of government, one in which the party that won a majority in the House and the Senate would be responsible for selecting the head of state. Considering what happens to leaders who can’t lead in the parliamentary system, I’m guessing that Joe Biden is thankful that we don’t have one.