Almost 90% of Earth's history occurred during the Precambrian time period
Preemption
This doctrine is centered around the attempt to repel or defeat a perceived imminent offensive or invasion. The aim is to gain a strategic advantage in an impending (allegedly unavoidable) conflict shortly before it materializes into a crisis. Its principles include unilateralism and the use of preventative war.
Feudalism started about A.D 700
I think it's A because they were displaced and leave their home
Hitler signed a non-aggression pact with Russia's leader, Joseph Stalin. Even though they promised not to attack each other, Hitler later invaded Russia.
