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.
They would agree with segregation is illegal because the constitution grants all equal rights.
<span>This is of course somewhat of a subjective question, but in general most would agree that the Roman Republic owned its success more to the military, because this is how it was able to claim territory. </span>
Aided europe financially , prevented spread of communism