Hey there!
During the cold war, East Germany was controlled by the Soviets, and West Germany was controlled by the British, Americans, and the French. As you can see, B West Germany was much larger.
I hope this helps!
The answer is imperialism.
Assimilation was considered one of the keys to successful imperialism. According to Oxfords dictionary, imperialism is a policy of extending a country's power and influence through diplomacy or military force.