the answer is b I just finished this and the answer was b.
They (Africans) were driven by their homelands.
Effect --> They conquered others + created powerful states up north.
Yes, it distracts you from concentrating on your work - for example if you're listening to a good song on the radio in the background, you'd shift your focus to listen to that instead of doing the task at hand, and begin to procrastinate.
Answer: The railroad allowed raw materials to reach factories in the East and consumer goods to reach all parts of the United States in a timely manner. Railroads helped to create the cattle industry on the Plains immediately after the Civil War. Cattle brought low prices in Texas, but demand was higher on the East coast.
Explanation:
