Why did the development of time zones make train schedules more reliable?

How did rituals maintain sumerian society

What are some effects outside of europe because of world war 1?

Which of the following is a likely reason that someone today might decide to move from a city in the midwest to the south? a. the decline of manufacturing in the midwest b. the many high tech jobs available in the south c. urban overcrowding in the midwest d. higher housing costs in the south