 Kunyange zvazvo kugadziridzwa kweTripartite Pact kwakanga kusati kwashanda, Hitler akasarudza kuzivisa hondo kuUnited States ndokurayira Reichstag, pamwe chete neItaly, kuita saizvozvo musi wa 11 December 1941, mazuva matatu pashure pokuzivisa hondo kweUnited States paUmambo hweJapan. Murairo waRoosevelt wokuti pfura paunoona wakanga wazivisa hondo yomugungwa kuGermany neItaly muna September 1941, uye Germany yakanga yaziva nezveRainbow Five mukuvamba kwaDecember. Hitler akanga asingachakwanisi kufuratira uwandu hwebetsero yezvemari nehondo iyo United States yakanga ichipa Britain neUSSR. Tariro dzaHitler dzokuti, pasinei nokurambwa kwakapfuura, Japan yaizorwisawo Soviet Union, hadzina kuzadzikiswa, sezvo Japan yakanamatira kunzira yayo yeNanshin yokuenda kumaodzanyemba, kwete kuchamhembe, uye yaizopfuurira kuchengeta rugare rusina kugadzikana neSoviet Union. Kunyange zvakadaro, kuziviswa kwehondo kweGermany kwakasimbisazve ukama hweGermany neJapan uye kwakaratidza kubatana kweGermany neJapan, iyo yakanga yava kukurudzirwa kuti ishande pamwe chete neBritain. Kusvika pamwero wakati, zviito zveJapan muSouth-East Asia nePacific mumwedzi yakatevera Pearl Harbor, kubatanidza kunyudza HMS Prince of Wales uye HMS Repulse, kubatwa kweCrown Colonies yeSingapore, Hong Kong, neBritish Burma, uye kurwiswa muIndian Ocean pamwe neAustralia, kwaive kurova kukuru kuhondo yeUnited Kingdom uye kwakabatikana neAllies, vachichinjisa maBritish kusanganisira eAustralia nemaAmerican zvinhu kubva kuHondo yeAtlantic neNorth Africa Campaign kurwisa Germany kuenda kuAsia nePacific kurwisa Japan. Muchirevo chechinyorwa ichi, mauto makuru eBritish Empire akabviswa kubva kuNorth Africa kuenda kuPacific theatre nevanotsiva avo vari chete vasina ruzivo uye vakapararira zvishoma zvikamu. Vachishandisa mamiriro ezvinhu aya, Afrika Korps yaErwin Rommel yakabudirira kurwisa mavhiki matanhatu chete pashure pePearl Harbor, pakupedzisira ichisundira mitsetse yevaAllies kure kumabvazuva seEl Alamein. 