No it does not. It still within the USA.
No. Antarctica is a continent, and is not a country with which another country could share a border.
There are not 17 states that border another country in the US only 16
The European countries that do not share a physical border with another country are Portugal and Iceland.
border
northwest
Texas
Canada or Mexico
obviously yes
Frontier: The part of a country that borders another country; border; boundary
No, Wyoming does not border any other country. It is bordered on all sides by US states.
Maine, New Hampshire, Vermont, Pennsylvania, New York, Michigan, Minnesota, North Dakota, Montana, Idaho, Washington, and Alaska all border Another Country (Canada). California, Arizona, New Mexico and Texas all border another Country (Mexico).
The territory that shares a border with another country in Canada is Yukon. It borders the U.S. state of Alaska to the west. Additionally, the Northwest Territories also share a border with Alaska, but Yukon is the only territory to do so directly.