Hawaii
The US shares borders with two other states (countries) - Canada and Mexico
Countries that share borders with other countries are referred to as "landlocked countries." Examples include Germany, which shares borders with nine countries in Europe, and Brazil, which shares borders with ten countries in South America.
There are 3 states & all of them share their land boundaries with 3 other countries-Arunachal Pradesh (shares boundary with Bhutan,China & Myanmar) West Bengal (shares boundary with Nepal,Bangladesh & Bhutan) Sikkim (shares border with Nepal,China & bhutan)
Both Hawaii and Alaska do not share borders with any other states.
Russia
Brazil shares borders with five other countries: Argentina, Bolivia, Paraguay, Peru, and Colombia.
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.
Jordan shares borders with a few other countries. The countries that border Jordan are Syria, Israel, Iraq, and Saudi Arabia.
South Australia :)
The United States shares borders with Canada to the north and Mexico to the south. It is also close to various countries in Central America and the Caribbean. Additionally, the United States has maritime borders with Russia in the Bering Strait and with the Bahamas, Cuba, and other countries in the Atlantic and Pacific Oceans.
Jamacia is an island in the Carribean Sea. Therefore it shares no borders with other countries.