The document summarizes and compares the political systems of the UK, Italy, and the USA.
1) The UK is a constitutional monarchy with a Prime Minister and bicameral parliament. Italy is a parliamentary republic with a President and bicameral parliament. The USA is a presidential republic with more executive power vested in the President.
2) The main differences are that the UK and Italian heads of state have symbolic power, while the US President has significant authority. The Italian Prime Minister also has less power than their UK counterpart.
3) Additionally, the work of the US President is subject to judicial review unlike in the UK and Italy, and members of Congress serve 2-year terms