The US government system was copied from the British government--House of Lords and Commons. The Commons represent the common man (mostly businesses and land owners in the beginning) and the Lords represent the aristocracy. The Commons allows for districts to have a voice in government and the MP of the Commons are elected by the people, whereas the Lords were appointed by station (birth right). The Senate began as an appointed house--elected by state legislatures to represent the state in all things federal, but the Constitution was amended to make for popular vote... Oh, you didn't mean that literally. Nevermind!Do You Know Why The US Senate Was Created?
I don't want to get into a heated argument over this but the US Representative form of government was created in direct opposition to the British form! The Founders purposefully took a completely different tack.
I've read all sorts of stuff about how it was the result of European Enlightenment. I've also read how some of those most responsible for the Articles of Confederation - the true foundation of our current system - based a lot of their idea upon the Iroquois Federation and other Native American societies. If you study them, you will see just how lose they came. The main difference came in establishing levels for agreement.
In Indian societies, debate went on endlessly until a unanimous agreement was reached. A way out was having the dissenters move away and create their own government.