The Kansas-Nebraska Act was controversial because it left the issue of whether slavery should be allowed to a popular vote, which brought about a series of violent confrontations called bleeding Kansas.
I don't believe it could exist
War could be considered truly fair if both oppositions had the same amount of soldiers, weapons, supplies, tactics, and geographical advantages.
Tere wil always be a difference of these factors in every war, so i don't believe such things as equal war exist.
The Bering Strait Land Bridge is a good example of this. During the Ice Age, humans from Asia migrated to what now is called North America in order to thrive in new lands, with new farming style.
