Answer:
I believe the printing press. Before the printing press books were very rare and expensive. Most religious scrolls were put on cloth or papyrus(a type of plant). After the invention of the printing press it made books less rare and expensive. And launched the world into a more modern era.
The main reason for the increased migration of African Americans out of the rural South during and following World War I was the "<span>(2) opportunity for factory jobs in the North" among other things. </span>
It was vital for workers to have Labor Unions and Labor Laws because Unions helped with education and it helped people improve their working conditions.
The Romans established a form of government — a republic — that was copied by countries for centuries In fact, the government of the United States is based partly on Rome's model. The ladder to political power in the Roman Senate was different for the wealthy patricians than for the lower-class plebeians.
