How about the sacking of Rome? I would say that it is rare because one preindustrial civilization would not have too much of an extra advantage over the other, whereas an industrialized and advanced civilization could have a clear advantage, especially when it comes to weapons.
earthquakes and civil war
Nope
they wanted to move to another countrycell phones
slavery
The Mycenaean civilization declined around the 12th century BCE, primarily due to a combination of factors rather than a single conqueror. Invasions by the Sea Peoples, internal strife, and economic troubles contributed to their downfall. The Dorian invasions, which followed the collapse of the Mycenaeans, are often cited as a significant factor that led to their defeat and the subsequent Greek Dark Ages.
The collapse of dictatorships in Latin America
dominant factor
Factors come in pairs. If you know one factor, divide it into the number. The answer will be another factor.
The common factor was environmental degradation, specifically deforestation leading to soil erosion and loss of resources. Hypotheses suggest that the collapse of Easter Island society was primarily due to the overexploitation of natural resources, resulting in a decline in food production, social unrest, and ultimately societal collapse.
No, that's just a factor. A common factor is when that factor is also a factor of another number.
A factor multiplies with another factor to create a product.
High mountain ranges