I decided to separate the historical videos from the rest.
These are VERY well done! They are historically accurate and they still keep the Hetalia characters in character (with some funny moments. ^^)
They deal with the whole 19th and 20th century in a realistic, historically accurate, fun and entertaining way! And what I like the most about them is that they depict history in a very neutral way, and they mention many countries!
19th century
20th century