Voice vote I hope this helps
B! The main goal was to keep slavery out of all western lands
The correct answer is agriculture. It was made possible for people to live on a single piece of land and not be nomadic anymore in search of food. Agriculture enabled them to settle around river valleys like Nile or Tigris and Euphrates. This is the era when civilizations started rising worldwide.
The second one isn't criticism, it's just a fact.