Chile is.
Chile has.
Chile and Santiago are the closest.
Easter Island in located off the coast of Chile, some 2180 miles
That depends on what "close" means to you. If your sense of 'closeness' is sufficiently sensitive, EVERY country might qualify. The country that has some territory MOST CLOSE to Antarctica but not on it, is Chile.
No. New Zealand is not the closest country. The very southern tip of Chile is the nearest point of a country to Antarctica.
New Zealand and Australia, Chile and Argentina.
Chile,Argentina,New Zealand,Australia
Chile is the southern hemisphere country that is closest to the US. Both countries have territories near the 90°W line of longitude at their closest points.
It is closet to the continent of South America. The closet country it is closet to Chile. In fact it is owned by Chile.
Chile
Both Argentina and Chile are closest to Antarctica.