Modeling themselves after the US Congress, itself modeled after the British Parliament (House of Commons and House of Lords).

I personally believe bicameral legislatures - allowing houses to deadlock on a bill - are a terrible idea. Either unicameral (used by one US State, Nebraska) or tricameral legislatures, with 2 out of 3 houses needing to approve a bill for it to pass, make much more sense.

Using the USA congress it was viewed a compromise between having reps for the people aka "democracy" and the Senate preventing the tragedy of the commons with a more "stable", less influenced by the populace groups of reps who would be more intellectual and conservative. They would represent the states at large (population not being a metric) rather than districts in the states more of a "republic" idea. That's why you'll hear the USA called a Democratic Republic and why idiots who say "we're a republic and not a democracy!" are almost completely wrong.

I actually have no idea, can you elucidate?