This is a big question. Civilization grows when you have a large population, a surplus of food, and a centralized government. The decline of civilization comes from warfare, repeated invasions, and disease.
Think of it like this
Free Citizens Vote
Meaning the 13th amendment freed slaves the 14th made them citizens and the 15th gave them rights to vote
Which describes the primary goal of Giuseppe Mazzini's Young Italy movement?
Mazzini wanted a united front in Italy. He believed that if the people were unified in an uproar it would bring the people of Italy together. Creating a united Italian nation.
Usually marriage happened after the age of 30