How did the railroads change the way Americans told time?

The underlying cause of confusion was simply that the United States had no time standard. Each town or city would keep its own solar time, setting clocks so noon was when the sun was directly overhead. ... So it's fair to say the American railroads changed the way the entire planet told time.

thurgood marshall

explanation: in 1954, thurgood marshall and a team of naacp attorneys won brown v. board of education of topeka, kansas. in this landmark decision, the supreme court held that segregation in public education violated the equal protection clause of the fourteenth amendment.