Axis Powers Hetalia anime series is basically a comical depiction of the events occur between World War I and World War II.
Based on a popular web-released manga series by Hidekazu Himaruya, this has been described as a "cynical gag" story set in Europe in the years between WW1 and WW2 (1915-1939), using exaggerated caricatures of the different nationalities as portrayed by a gaggle of bishĹŤnen.
For example, the Italia Veneziano character is into pasta and women. The Deutsche (German) bishi loves potatoes and sausages, and Nippon is an otaku boy.
Again to sum it all, Axis Powers Hetalia series uses satire and comedy to address well-known and lesser-known historical facts.