“The USA is a federal state with governmental powers distributed between the states and the federal government. The UK is a unitary state with political power concentrated within central government.” The current systems of government of the United States and the United Kingdom have evolved and developed along very different lines.
Both the U.S. and British political systems have a head of state, a court system and an upper and lower house. Both have constitutions that lay out the rules for government and the rights of the people. Both systems are democratic in nature in that governments are put in place and removed from power by the will of the people and both have systems of checks and balances to limit the power of any one branch. Perhaps the most fundamental difference between the American and British political systems is the constitution - or the lack of one. The United States has a written constitution as does the vast majority of nation states. The UK does not have a single document called the constitution but instead its constitutional provisions are scattered over various Acts of Parliament.
The government of UK is a constitutional monarchy.The US government is a representative democracy.
A defining feature of the American constitution is the strict separation of the powers of the executive, the legislature and the judiciary. The British political system has no such formal separation of the powers.
The most obvious of the differences between the American and British political systems is that the USA is a presidential system, with the peak of power in a directly-elected President, whereas the UK is a parliamentary system, with the Prime Minister holding office and power only so long as he or she commands a majority of votes in the House of Commons.
In the U.S. political system, the president is the official head of state. The president is elected under the electoral college system. In the U.K., although the prime