Answer:
I'd say the answer is "Appropriation"
Step-by-step explanation:
Annexation, an act whereby a state proclaims its sovereignty over territory hitherto outside its domain. Unlike cession, whereby territory is given or sold through treaty, annexation is a unilateral act made effective by actual possession and legitimized by general recognition.
An example of annexation: In 1938, for example, Nazi Germany marched into Austria and conquered it. They claimed that they wanted to unify the Germanic people and annexed the former nation of Austria into their country.
Appropriation is the action of taking something for one's own use, typically without the owner's permission.
They're both similar.
Please correct me if I'm wrong.