One of the differences between Britains Government and The USA's is that we have a checks and balance system and Britain does not.
Another difference is that Britains Government has a King and Queen, even if they do not have much power they still apoint the Prime Minister who does have power, The USA's government has a president and many different offices under him so the people get a say in whats happening in there government.
One of the similarities for between our governments are that we have two big different political partys like the Democrats and Republicans
Another similarity would be that our president mirrors the Enlighs King or Queen but Our president has alittle more power than a Queen would.