Take the Gold Rush for an example. Many people traveled on long journeys to migrate to California because of the gold. The gold promised a lot of freedom, safety, and a brighter future. Migration isn't all sunshines and rainbows though. One example was the Trail of Tears where many native americans were forced by Colonizers to move to different plots of land, leaving behind their homes.
You don't have the options, but i would say it means that books can take us to another place mentally and take us away from our problems. Hope it helps !:)
