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Ontario
Afghanistan does.
Arizona
Wisconsin
New Mexico is one of the States of the Four Corners region and therefore shares a border with Arizona, Utah and Colorado. It has its longest US border with Texas and also has a border with Oklahoma and International borders with the Mexican States of Chihuahua and Sonora.
The province of British Columbia shares a border with only one other province - Alberta. The Province of Newfoundland and Labrador shares a border with only one other province - Québec. All the other provinces share a border with at least two other provinces.
The province of Ontario, Canada shares the point on the US border at Niagara Falls, New York.
The Country that shares the southern Border with the US is Canada.
Two countries share a border with the United States. To the north, the US shares a border with Canada. To the south, the US shares a border with Mexico.
British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, and Quebec are the Canadian Provinces that shares their southern border with USA.
Alaska shares its entire eastern border with Canada, more specifically, Yukon Territory and the Province of British Columbia.
Ontario, we have no northern provinces.
CanadaCanada shares the longest border with the US.
That depends on what your province is - you needed to say that in the question for us to answer it.
Canada and Mexico
Canada does
Mexico