I ASK AGAIN WHEN WILL THE US RETURN TO A TENNIS WORLD POWER?
When there are good enough tennis players in America?????
When there will be good players again
We still are if you are talking about Women's tennis, if you mean the men, it's hard to say and it depends on how you define 'tennis world power', if you mean get more than one player in the top 5, I think it's a ways off, if you mean have a US man win a grand slam tournament, that's hard to say but it probably won't happen until after Federer,Nadal & Djokovic retire.
When they get a group of players that can compete for the top 5 spots and remain there consistantly.