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Parliamentary is the correct adjective - but I'd said the US adjective is 'presidential' - ie a president is elected, and then they appoint the cabinet etc. 'Federal' is to do with subsidiary divisions (with the -ist suffix it's a belief in how much power the central government gets, isn't it?) - eg Canada is both parliamentary and federal.
It has to be a specific 'vote of confidence' that the ruling party loses. This means the parliament no longer supports the prime minister or equivalent; the head of state must either appoint a new one (which they'll only do if they can be confident the new one won't lose another vote of confidence at once), or call an election.
Most parliaments in large countries are bicameral, with one house where the main power resides (eg House of Commons in the UK) and another that acts as a check. In the UK, the House of Lords is now mainly (90%?) appointed for life, and 10% hereditary (the hereditary lords are on the way out; some people want some elected lords to replace them, Blair wants to appoint all of them via a commission that he chooses). The Lords can delay legislation, but the Commons can force it through after, I think, 3 years (just a simple majority needed for this). In theory a monarch or ceremonial president canalso veto a law; in practice this doesn't happen (eg when a pro-abortion law went through Belgium a few years ago, the Catholic king abdicated for the afternoon so he didn't have to sign it, but it passed in his absence).
Speed of laws? As I said, the Lords can delay laws by 3 years, but it rarely goes that far. In the UK, MPs vote with their party more than the USA reps, so a government with an absolute majority does expect to get most of its legislation through in a year (amendments might hold it up a bit; we don't go in for the omnibus bills that Congress seems to love - they normally do what they say in their title).
Foreign Secretary isn't necessarily the number 2 slot - in the UK, it's probably finance minister, especially at the moment, in terms of the power they wield. In the UK, there isn't necessarily an obvious pecking order in a party, and it's tended to be people appointed to jobs more suited for them. This often means there's a progression from Defence Secretary to Foreign Secretary, and from the junior finance minister to the senior one, and so on. There's also a post of Deputy Prime Minister, which isn't always filled - the cabinet system has some flexibility - which sometimes gets real responsibility, and sometimes is more a 'lame duck' position. We haven't had a true coalition since before WW2, but I believe that the posts filled by junior parties are negotiated each time a coalition is formed.
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