Sentence:  Mexico , Panama , and Venezuela are displaying open sympathy for Castroism , and there is no country - save the Dominican Republic whose funeral services we recently arranged - where Castroism and anti Americanism does not <WSD>prevent</WSD> the government from unqualifiedly espousing the American cause . 
Meaning of the word marked with <WSD> tags:  stop (someone or something) from doing something or being in a certain state