Dee ihe na-aga n'ihu na paragraf a - Na 7 na 8 Disemba 1941, mwakpo ndị Japan wakporo Pearl Harbor sochiri mwakpo ha wakporo Malaya
na, na 8th, Churchill kwupụtara agha na Japan. Ụbọchị atọ ka e mesịrị, Germany na Ịtali jikọrọ aka kwupụta agha megide United States. Churchill gara Washington na ngwụcha ọnwa ahụ iji zute Roosevelt maka ọgbakọ Washington mbụ (aha nzuzo "Arcadia"). Nke a dị mkpa maka "Europe First", mkpebi nke ibute mmeri na Europe ụzọ karịa mmeri na Pacific, nke Roosevelt mere mgbe Churchill ka nọ n'etiti Atlantic. Ndị America kwenyere na Churchill na Hitler bụ onye iro bụ́ isi nakwa na mmeri a meriri Germany bụ isi ihe ga-eme ka ndị Allied nwee ihe ịga nke ọma. E kwekọrịtara na nkwekọrịta nkwekọrịta mbụ nke Anglo-American ga-abụ "Operation Torch", mwakpo nke French North Africa (ya bụ, Algeria na Morocco). E bu ụzọ mee atụmatụ ya maka oge opupu ihe ubi nke 1942, emesịrị malite ya na Nọvemba 1942 mgbe Agha El Alamein nke Abụọ nke dị oké mkpa na-aga n'ihu.