The three fifths compromise was an agreement on how to count slaves for the purposes of taxation and Congressional representation. A slave would count as 3/5 of a person.
In 1804 the first electoral college was put in place
Benefits- The people have choice in who runs the country and which laws to place, and No rash decisions can be made without confirmation from multiple parties
Challenges- the first voting of the new leader, and setting up representatives for the new government
Depends on which civilizations you're talking about
1st, Say something along the lines of "The (Civilization on one side) is (Their characteristics) and are (Ruthless, Peaceful, etc. Describe their demeanor), but what makes them so different from the others? The (Other Civilization) is involved in (Something similar to the first), which (Civilization 1 ) takes part in as well. But what are their differences?"
Sorry if this was slightly confusing but I write Compare/Contrast essay thesis statements literally every day and I've gotten 100% every time.
Hope this helps :)