TheunitedstatesofAmericaissomekindofdifferentintheworldfromothernations.
First,wehavetotakeconsiderationaboutthehistoryofthecountry,weallarefamiliarwithitanyway,thenativelivinginthenorthAmericaisIndians,butduetothefamousColombo,millionsofwhitepeoplecomingfromEuropeanandothercontinentsmovedthere.Thus,withanotverylongtime,thesocietyoftheunitedstatesestablished.Soweknowtherearemanypeopleofdifferentracessettledthere.Andofcourse,thespecialcharacteristicsofthenationscomefromthisreason.
Besides,therearetoomanyreasonstoanswerthisquestion,butinmyopinion,youshouldsearchtheinternetorlookintobookstofindyourselftheanswer,it'syourworkisn'tit?
Goodluck!