简介:NewYorkCityisthelargestcityinAmericatoday.Butinthe18thcenturyitwassmallerthanPhiladelphiaandBoston.InearlyAmericanhistory,Bostonwasthemostimportantcityinthecountry.Later,Phi-ladelphiagrewandbecamemoreimportant.Intheearlyyearsofthe19thcenturyBoston,PhiladelphiaandNewYorkremainedmoreorlessequalinsizeandimportance.Finally,in1823,aneventtookplacethatgaveNewYorkCity,onceandforall,itsleadingposition.Thiseventwastheopeningofth...