Summary and Preview
Think of it like WWII, except every country is a pretty boy instead. A hilariously stereotypical pretty boy. America loves burgers, Russia is into the vodka, and China has pandas and a Wok.
It is centered mostly around Italy, who has both a North and South character. The "Hetalia" portion of the name is probably mocking Italy, as "hetare" means "useless."
Note: The manga is serialized on its official website with Gentosha publishing the tankoubans. The author is a Japanese American who was born and raised in New York. Primarily women (with a huge BL following) and military enthusiasts read this manga.
Official Anime Movie Site: here.