It has a racial inequalities that change over time
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 correct answer is option C) Steam Engine
Steam Engines were developed in the 1st Industrial Revolution in England. They led to the development of trains which provided fast travel throughout the country.
Steam Engines require the burning of coal to make steam and push machinery. This meant that the Steam Engine and Coal were perfect complimentary products and the increase in demand for one, would automatically increase the demand for the other.
Railway lines completely transformed countries as more and more goods and people could be transported cheaply and quickly.
From England, steam engines and trains spread to Europe, the US and other parts of the world and for the next 150 years, trains became the preferred mode of transport.
Around 2000 people in BC E their migration was (B)
