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The Second World War or World War II was an international military conflict, mainly fought with the UK, the USA and Free France who defeated the alliance of Germany, Italy and Japan.
In the TMNT Adventures, Splinter, as Hamato Yoshi, grew up in Hiroshima experiencing the USA launching an atomic bomb onto Hiroshima.
Later in the TMNT Adventures series, during the Dreamland storyarc, a timeslip generator opens a portal to Germany at the time at the end of the war.