Answer:
Geographical differences
Explanation:
The united states are known for their diversity, for example, politics, social and race, ethnicity. This is all over the perception of diversity. There is regional variation also occur in the united states. There are divided blue state and the red states, poor states and the rich states, healthy states and unhealthy states. Personality differences also indicated regional differences.
So that Kai and his family live in the small town in Minnesota and Amelia and her family live in Boston. So that according to the geographical differences both families are poor.