Canadian provinces are part of Canada so they can't border against themselves. This is like asking which state is next to the United States which doesn't make sense since all U.S. states are part of the U.S.
Lake Michigan is all USA borders. The others have part of Canadian borders.
Three U.S. states that are south of Canada are Washington, Montana, and Minnesota. These states share a border with Canada and are located in the northern part of the continental United States.
The interior Plains in the US are primarily located in the central part of the country, stretching from the Canadian border in the north to the Gulf of Mexico in the south. States within this region include North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, and Texas.
The closest Canadian city to the US border is Surrey, located in British Columbia. It is part of the Greater Vancouver area and shares a border with the US state of Washington.
New Brunswick, Canada is east of Maine, USA.
Canada or Mexico
There are two states that do not share a border with any other state: Alaska and Hawaii. Alaska is located in the northwestern part of North America and is separated from the contiguous United States by the Canadian territory. Hawaii is an archipelago located in the central Pacific Ocean.
Quebec, Canada
The Midwestern states are a part of the United States and they are located in the middle of the country. They border other states in the country.
The city farthest from the Canadian border is San Diego, California. Located in the southern part of California, it is approximately 1,400 miles away from the nearest point of the Canadian border. Its coastal position and southern latitude contribute to this significant distance from Canada.
The Canadian province that forms part of the eastern border of New Hampshire is Quebec. This border is defined by the Connecticut River and extends northward, with Quebec lying to the east of New Hampshire. The region features a mix of natural landscapes and is characterized by its proximity to both the U.S. and Canadian borders.