How is the British Pariliamentary govt different from the US government?

Answer 1

The Prime Minister is leader of the majority party in the House of Commons. Therefore, whichever party has the most members elected will be in control of the government. The Prime Minister is the Head of Government.

The Queen is the Head of State and the Prime Minister reports to her.

In the US, the President - elected indepently of the Congress - is both Head of State and Head of Government. The President is frequently (as right now) not from the same party as the majority in the two houses of Congress.

In parliamentary systems small parties usually have more influence than in two party systems, such as the US. However if third party members don't join a coalition with the Majority or the Opposition they are left out of government and sit out most debates.

Answer 2

we're well aware of that. the point of much of the Constitution, as clarified by James Madison, is to provide the government with just enough power to do what only the government can do and not a whit more. There is nothing much to prevent the American government from becoming tyrannical if the Constitution is abandoned or amended severely. Such a government could, for example, seize the assets of the rich without compensation [payment] in order to redistribute the ownership of society 'more equitably' among the people. Nothing that is, except that the armed people rise up to defend the government that assures them of individual liberty and rights and to put down a tyranny [should one arise]. {If that happens, I would hope that the then new government reserves critical jobs for discharged military people and limits the right to vote similarly -- the ancient Roman Republic knew a thing or two about survival; they lasted a lot longer than we have, so far.}