annex

nouns

an addition that extends a main building
annex, annexe, extension, wing

verbs

take (territory) as if by conquest
"Hitler annexed Lithuania"
annex
is a type of (narrower)
seize and take control without authority and possibly with force; take as one's right or possession
"He assumed to himself the right to fill all positions in the town"; "he usurped my rights"; "She seized control of the throne after her husband died"
arrogate, assume, seize, take over, usurp
attach to
annex
is a type of (narrower)
add to the very end
"He appended a glossary to his novel where he used an invented language"
add on, affix, append, supplement