Krogan Rebellions

Krogan Rebellions is the collective name for 300 years of aggressive expansion and population growth by the Krogan race. During this time they forced out other races from their homworlds, sustaining massive casualties in the process. Krogan birth rates were such that a war of attrition favored them and until the Turian used the Salarian-engineered genophage, a powerful bio-weapon, on the Krogan that the tide was turned.