Hey, is there a map of where the boundary is between say US East and US West?

I am in Toronto, Ontario, Canada so I'm pretty sure I am on the US East Server or whatever. I have a friend in Austin, Texas, USA. If he buys SC2, is it gonna be a US East copy so we can play together? I have heard of how its impossible to play with people from say Russia or any part of Europe... Wormer comes to mind as a SC1 friend who I can't ever see in SC2 for example. So yeah... is there a map of these boundaries? Is it possible to specify which gateway version of SC2 you're buying?

North America is one gateway, which encompasses both East and West. There is also one for South America, South East Asia, Europe, Korea/Taiwan, and possibly a separate one for China, although I'm not sure about that.

That's a relief, thank you!