Sentence:  Most immediately relevant to these episodes in Goa , Katanga and Ghana , as to the Suez-Hungary crisis before them , is the belief that the main theater of the world drama <WSD>is</WSD> the underdeveloped region of Asia , Africa and Latin America . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)