I'm learning about it in history after all. Though we're missing Serbia. WE NEED A SERBIA!

Kosovo War?o.o

Cold War is a close second.

Same with me! ⌒.−)＝★

WW1 is a close second,they seem like they would be interesting Hetalia wise.

uuuummmm...if this is Hetalia Wise, there was no Vietnam War or Cold War. Let alone Iraq. I think you should've said 'Historically Wise'.
But yeah WWII is my all time favorite subject. Not just because it involved Japan and America kicking each others butts but because it was funny when the Axis and the Allies were on the same island together! That was some funny episodes. ;)

When I added 1812/7 years war, I mean from Canada's perspective when America invaded him. :)

I have always been interested by WW2 but watching Hetalia made it more interesting to watch videos from WW2 and read about it :)

i learnt about it one week ago. i love it

The other ones that interest me is the Opium and Korean War.

Hetalia Wise as in imagining the characters be i the war themselves.
For Example
Cold War:
America Fighting Russia and kicking Russia's butt(EPIC ~!)

the world war makes me wonder about them fighting to.....and the American Revolutionary War reminds me of the 5th grade.NOT a good year for me T^T

WWII is a very interesting topic along with the Revolutionary War and Cold War. I voted for WWII, but I would also like to see a few episodes focused on the Revolutionary War. It would be really cool if the Cold War were covered, as well (after WWII, of course). However, I wish the anime would focus more on the modern world history, especially WWII (including how America got involved). I found that Axis Powers and World Series have been "all over the place" at times storyline-wise, making things kind of hard to keep track of. That's just my opinion, though. Overall, Hetalia is AMAZING! Can't wait for Season 5: Beautiful World!

The Cold War also really interests me.

I can't choose one. Europe's imperial/monarchical wars always interests me so as WWII even more than our local history.