Detailed Instructions: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Q: Sentence: 'For this reason the United States became involved in Vietnam because it believed that if all of the country fell under a Communist government , Communism would spread throughout Southeast Asia and further .', Argument/Subject 1: 'unite state', Argument/Subject 2: 'vietnam'
A:
be involve in