Connecting past and present helps you see how humans have chosen to deal with conflict, which can lead to war, political debate, neighborhood riots, discrimination, etc. But also linking past and present helps us see how humans have solved any problems they have come across. Whether it be an economic issue, something that effects many people, or a personal issue.
Answer:
I would focus on how one of the empires lasted for nearly 2 millennia (if you count Byzantium as Rome), and how the other fell apart very soon after the empire’s namesake “Alexander” perished.
Explanation:
The USA is a presidential system, with the apex of power in a President elected indirectly through an Electoral College, whereas the UK is a parliamentary system, with the Prime Minister holding office and power so long as he or she commands a majority of votes in the House of Commons.