Yeah too bad we didn't know he was killing everyone until about 1944ish. We joined the war because Britain is such a pussy country.
No, we joined the war because Japan attacked us.
Exactly.
And it wasn't just Britain fighting against Germany/Russia/Japan, it was the UK, Canada, Italy, France, Australia, South Africa, New Zealand, Poland, and others. After the attack on Pearl Harbour, the crappy countries joined (Panama, Haiti, Costa Rica, Cuba, and.. oh yeah, the US)
Remember how Canada got bitched at for not helping you fight in Iraq? Well, consider that pay-back for not helping us in what was eventually to be called WW2