Geography was a huge part in slavery because in Africa the people were hungry so they would give/sell the weakest people in Africa to the colonies in order to survive. The south had the largest amount of slavery and north the lowest this caused arguments which later led to the civil war, this is how geography has shaped slavery
I believe the answer would be New England
I would have to believe that the battles of Athens and Spartas are the important popular because of the historian efforts.
The use of redistricting to unfairly disenfranchise specific groups of people
Gerrymandering is definitely not a legal process though some try to get away with it. It's used by the political party in charge of redistricting to skew the proportion of voters in a district towards their political party so they receive more representation in the government than other parties.