Imperialism is when higher powers decide to take over your land and make you one of them without your consent. Imperialism started in Africa and is portrayed in the film Avatar.
Just like the natives in Africa had to fight, so did the Na´vi in Avatar. The Na´vi fought to protect their mother tree. As the Africans fought to protect their home land. The Americans try to take their land for a mineral, unobtaniam.
Many African natives revolted against imperialism and fought for their land. They wanted their freedom restored but unfortunately many failed.
¨Africa was also a source of raw materials that could be manufactured¨. Raw materials is one of the most valuable reasons why Europeans took over some of Africa.