Hi, Howard-
I think it depends where you are in America. I've never heard the term "Worcester Sauce" - it's usually "Worcestershire Sauce." It's not generally known by brand name, so I'm surprised you got what you wanted; but if you ask for "Worcestershire Sauce" in a decent establishment, you'll usually get Lea & Perrins. It's not unusual for people to put it in tomato juice, but you're more likely to see people in the US put Tabasco sauce in their tomato juice.

-Joe-