Post alteration stagnation
This is when preventing a major development in another timeline prevents it from developing at all
Typically in fiction if a major development is prevented in the past you can expect the resultant timeline to stop developing one or more of culturally, ideologically, politically and technologically (the one always being the one that the nature of the development was) Basically suppose I went back in time to AD 50 murdered Nero before he had time to put an end to the Julio-Claudian dynasty, the results of this action are totally unpredictable but chances are the Julio-Claudian dynasty and the roman empire would have ended some other way eventually. In most alternate history stories however this would likely lead to a Julio-Claudian dynasty ruled Roman Empire still in charge of Italy today
Hello, Unknown Troper. You'll need to get known to lend a hand here.