Not positive this is all correct, but it appears that California, Louisiana, Michigan, New Hampshire, North Dakota, and Vermont are the only states 3 three bordering states.
California, North Dakota, Louisiana, Michigan, Delaware, New Jersey, New Hampshire, Vermont, Connecticut. I think that's all of them.
Mississippi
Here are two of them: Rhode Island is bordered by Conneticut and Massachusetts Washington State is bordered by Oregon and Idaho.
colorado
There are no countries in the US.
Tennessee
No, Wyoming is completely surrounded by other US states.
Canada is bordered by the US only.
Alaska and Hawaii each border no other states.
Alaska is one of two US states not bordered by another state, Hawaii is the other. Alaska is bordered by Canada (by the Canadian provinces of Yukon Territory and British Columbia) to the east, and has a maritime border with Russia to the west.
Maine is the only U.S. state that is bordered by only one state. Maine is bordered by New Hampshire to the west, the Atlantic Ocean to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and northwest respectively.
Alaska and Hawaii share no borders with US States.
Alaska is bordered by the Arctic and Pacific Oceans.