Hi! The keyword answer should be : Emancipation.
The emancipation edict freed an estimate of over 20 million serf slaves!
I hope this was helpful.
Because it is different then all the other continents are defined
Feudalism is the prevailing social framework in medieval Europe, in which the honorability held grounds from the Crown in return for military administration, and vassals were thusly inhabitants of the nobles, while the workers were obliged to live on their ruler's property and give him reverence, work, and an offer of the deliver, notionally in return for military insurance.
During WWII, the tide turned on the Asian theater during the Battle of Midway.