Answer:
A. The election of Barack Obama
Explanation:
Post racial era refers to the United States being free from racial discrimination, segregation and preference.
Barack Obama was elected President of the United State in 2008 and was regarded as the first black president of the county. This made people to conclude that the United States has truly reached its post racial era.
Rural people had farms and thus needed more workers so they just had a bunch of kids to help out. if the city they didn't need a bunch of kids.
The reason that gave birth to similarities between the Almoravid and the Almohad empires which were Muslim dynasties was the pilgrimage that they undertook. This is because as a result of this pilgrimage, they brought back foreign Arabic culture and influences to their respective empires. Because the origin of these cultures was the same, it lent similarity to the two empires.