Pedzisa mutsara unotevera: Pana 7 na8 December 1941, kurwisa kweJapan paPearl Harbor kwakateverwa nokurwisa kwavo
kupinda muMalaya uye, musi wa8, Churchill akazivisa hondo kuJapan. Mazuva matatu gare gare kwakabva kuziviswa kwehondo pamwe chete neGermany neItaly kurwisana neUnited States. Churchill akaenda kuWashington gare gare mumwedzi wacho kunosangana naRoosevelt nokuda kweMusangano wokutanga weWashington (zita romutemo "Arcadia"). Ikoku kwakanga kuchikosha nokuda kwe"Europe Kutanga", chisarudzo chokutanga kukunda muEurope kukunda muPacific, chakatorwa naRoosevelt apo Churchill akanga achiri pakati peAtlantic. VaAmerica vakabvumirana naChurchill kuti Hitler akanga ari muvengi mukuru uye kuti kukundwa kweGermany kwakanga kuri chinhu chinokosha kukubudirira kweVasonganiri. Zvakare zvakabvumiranwa kuti kurova kwekutanga kwakabatana kweAnglo-America kwaizove "Operation Torch", kupindirwa kweFrench North Africa (kureva, Algeria neMorocco). Pakutanga yakarongwa kuti iitwe muchirimo cha1942, pakupedzisira yakatangwa muna November 1942 apo Hondo yechipiri inokosha yeEl Alamein yakanga yatotanga.