The early United States was overwhelmingly rural. This would quickly change, and New York soon became the center of American commerce. As the cities grew, transportation was an increasingly urgent problem. Some kind of public
transportation would be needed if the cities were to continue developing.

• Trefwoord
  GESCHIEDENIS VAN DE SPOORWEGEN, EVOLUTIE, SPOORWEGNET, STADSVERVOER, STOOMTRACTIE, TRACTIE MET BEHULP VAN LASTDIEREN, ELEKTRISCHE TRACTIE, ETATS UNIS