No, Antarctica has always been "public property". Anyone may explore it. Though International laws prevents you from taking it over.
Yes, have you ever partnered with another company in a joint venture before?
It means have you joined securely to another thing or job.
Asia was a butyrumoinpitcal country it also was a doingdt country
Yes, Brazil.
The United Kingdom
Yes but only very rarely - that is why Antarctica is a desert.
There is no city -- nor has there ever been a city -- in Antarctica.
Antarctica has not ever been involved in war.
No.
no
mostly by the russian empire
Each one of the current 50 states that make up the US joined the Union at some point or another. No states were ever forced to join, and no states were automatic members.