Servicemen relaxing from the rigors of the Vietnam War poured millions of dollars into the Wan Chai boom of the 1960s.
Soldiers from the Vietnam War had lots of money to spend there.  
mnli hypothesis: Soldiers from the Vietnam War had lots of money to spend there.   premise: Servicemen relaxing from the rigors of the Vietnam War poured millions of dollars into the Wan Chai boom of the 1960s.