Imperialism: A policy or ideology by which a nation extends its power by acquiring territories. It can be compared to a popular kid in school who tries to control others around him/her.
Independence Movements: These are movements that aim at achieving independence for some territory that is considered 'occupied' or 'colonized'. Like students protesting against school policies they believe are unfair.
Post-colonialism: The study of the legacy of colonization and imperialism. It’s like looking back at your childhood and understanding how it shaped you as an adult.