User blog comment:Madster./Spain- Reconquista/@comment-4099026-20120317153739/@comment-3242795-20120319194425

WWII was officially a world war when we declared war on the Japanese, and Germany and Italy declared war on us. That is when it was a WORLD WAR. If you're asking how the whole conflict started, it began when Adolf Hitler invaded Poland in a blitzkrieg, and two days later, Great Britain declared war.