to ▁un for ese en ▁errors . ▁Because ▁it ▁is ▁a ▁discovery ▁process ▁that ▁dis clos es ▁lat ent ▁errors ▁so ▁we ▁can ▁learn ▁how ▁to ▁deal ▁with ▁them , ▁trial ▁and ▁error ▁also ▁low ers ▁risk ▁by ▁reducing ▁the ▁scope ▁of ▁un for ese en ▁d angers . ▁Tri al ▁and ▁error ▁samples ▁the ▁world ▁of ▁as ▁yet ▁unknown ▁ris ks ; ▁by ▁learning ▁to ▁co pe ▁with ▁ris ks ▁that ▁become ▁evident ▁as ▁the ▁result ▁of ▁small - scale ▁trial ▁and ▁error , ▁we ▁develop ▁skills ▁for ▁dealing ▁with ▁whatever ▁may ▁come ▁our ▁way ▁from ▁the ▁world ▁of ▁unknown ▁ris ks . ▁ ▁Theory ▁of ▁dual ▁presiden cy ▁During ▁the ▁Cold ▁War , ▁Wild av sky ▁proposed ▁" The ▁D ual ▁Pres iden cy ▁Theory " ▁( also ▁sometimes ▁referred ▁to ▁as ▁the ▁Two ▁Pres iden cies ▁Th esis ). ▁In fl uen ced ▁by ▁the ▁time ▁period ▁of ▁ 1 9 4 6 – 1 9 6 4 , ▁the ▁D ual ▁Pres iden cy ▁Theory ▁is ▁based ▁on ▁the ▁principle ▁that ▁there ▁are ▁two ▁versions ▁of ▁the ▁American ▁President : ▁one ▁who ▁is ▁concerned ▁with ▁domestic ▁policy ▁and ▁one ▁concerned ▁with ▁foreign ▁policy . ▁ ▁Wild av sky ▁makes ▁the ▁claim ▁that ▁pres idents ▁would ▁prefer ▁to ▁focus ▁for em ost ▁on ▁foreign ▁policy ▁because ▁he ▁is ▁granted ▁more ▁traditional , ▁constitution al , ▁and ▁stat ut ory ▁authority ▁when ▁compared ▁to ▁his ▁domestic ▁policy ▁powers . ▁ ▁Wild av sky ▁arg ues ▁that ▁pres idents ▁have ▁assumed ▁a