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.

Sentence: 'In 1973 , Ireland joined the European Economic Community which later became the European Union .', Argument/Subject 1: 'european economic community', Argument/Subject 2: 'european union'
become

Sentence: 'Obama and his followers should move to Chicago .', Argument/Subject 1: 'obama', Argument/Subject 2: 'chicago'
move to

Sentence: 'Beijing , the capital of the People 's Republic of China , is the epicenter of Chinese culture .', Argument/Subject 1: 'beij', Argument/Subject 2: 'china'

be capital of