Imperialism: Imperialism refers to the policy of extending a nation's power and influence over other countries through colonization and acquiring territories. It was one of the dominant global trends during the late 19th and early 20th centuries.
Decolonization: Decolonization refers to the process by which colonies gained independence from imperial powers. After World War II, many nations pushed for self-determination and ended colonial rule.
Nationalism: Nationalism is an ideology that emphasizes loyalty and devotion to one's own nation or ethnic group. It often leads to movements seeking self-rule or independence from foreign powers.