As a history buff, this made me cry...
Dude, seriously, you couldn't be bothered to do more research with this? Really? With info so readily available... Had you made real historical jokes, this could have actually been pretty funny, but you just tread over dull nationalist stereotypes. I'm sorry, I just have a real fascination with this turbulent period of history, so inaccuracies and simplification on THIS scale really get my goat.
I will say, though, that the lip-synching was not bad, though your UK accent needs work. But if you EVER do a historical piece, you MUST have done at least basic research, rather than just skimmed a textbook. There is so much comedy in History, but if you actually search it out, anything based on it will turn out infinitely better than something just skimmed from memory of history classes.
Oh well...at least you considered doing a historical piece rather than tired video game and anime stuff. Now you just have to get the history right ;)