Tennessee or Missouri; both share borders with eight states.
Both Hawaii and Alaska do not share borders with any other states.
California is in the United States, it borders only one other country. That is Mexico. More specifically: the State of Baja California Norte, Mexico. The states that share borders with it are Arizona, Nevada, and Oregon.
Illinois shares land borders with several other US states and one of the Great Lakes, but does not share a border with another country. It is possible, though, to travel by boat from Illinois to Canada.
Tennessee and Missouri they border eight other states
No states share borders with Alaska
California is in the United States, it borders only one other country. That is Mexico. More specifically: the State of Baja California Norte, Mexico. The states that share borders with California are Arizona, Nevada, and Oregon.
All countries share borders, although these may not always be land borders. Australia, for example, shares no land borders with any other country, but it does have maritime borders with other countries.
Both Tennessee and Missouri share borders with eight other states.
Washington D.C is a city, not a country. It shares borders with the states of Maryland and Virginia.
Missouri has to be one of them and Tennessee is the other.
Canada borders New York.