It was an almost successful attempt to destroy Anime before it destroyed humanity.

If Japan hadn't been involved in WWII, there would be thousands more animators. So many, in fact, that the world's entertainment industries would have been flooded with anime. Eventually sex would stop completely. The final generation of men died looking at animated porn as they shot the salvation of the human race into a crusty tube sock.

It was women who took action. They built a time machine and went back to stop Japan from unleashing anime on the human race. They went back to when the last time men were mainly not little bitches. 1941.

They numbered in the hundreds of thousands. Ready to do what women do best. Get the men to do it for them.

After building a fleet, and an Air Force, they struck off to end the waifu menace once and for all. Then, and only then could they retreat back to their kitchens and bedrooms to reward the men as only women can. With deliciously prepared food and enough unprotected sex to birth a Boom of a generation of Babies.

Now, 71 years later, the bitch-men have returned. Espousing a decadent and selfish lifestyle of Anime and Waifus.

It appears the women's job was a failure

Actually the earliest known record of anime was in 1917.

While true, there wouldn't have been enough animosity towards the Japanese in 1917 to destroy them. In fact, they were allies in WWI.