lucy24 - 12:02 am on Jul 6, 2011 (gmt 0)
isn't the .us the USA tld?
No, the US got there first so they're unmarked. Even the federal government is .gov, not .gov.us. Similarly .mil, meaning US military, and .edu, formerly meaning accredited universities. Individual states are .ca.gov and so on, not to be confused with .gov.ca which would be the Canadian government. (It actually isn't-- it's .gc.ca* federal, .gov.nn.ca for provinces-- but that's their decision.)
* I had to ask a Canadian-- well, a Newfoundlander-- what "gc" stands for. Oops.