There are many similarities between the democracy of British and American democracy.
Step-by-step explanation
Bicameral or two-tier system of legislature in Britain and america. Both the governments are executive led governments. The Prime minister is the head of the state in Britain and President in america. A little difference which can be seen is the British government holds constitutional monarchy whereas in America, there are three branches of the governments which has equal powers and regulates the operations of the other branches as well.
In US, it is the representative democracy that exists. the head of the state, who is the president is elected by the representatives of the people. all constitutional monarchy can be representative monarchies but all representative democracy cannot be constitutional monarchies.