Just Montana.
The western states in the 48 contiguous states that have the longest border with Canada are Washington and Montana. Washington shares a border with British Columbia, while Montana shares a border with Alberta, Saskatchewan, and British Columbia.
Canada, Mexico, and Russia border the United States.
North Dakota and Minnesota border Manitoba.
The Rocky Mountains form the border between Alberta and British Columbia in Canada.
Mexico is the country on the southern border of the United States.
Only one US state borders Alberta, Canada, that being Montana.
British Columbia, Alberta, Saskatchewan, Manitoba, Ontario and Quebec border the United States.
Two provinces in Canada share a southern border with the United States: British Columbia and Alberta. British Columbia borders the U.S. states of Alaska and Washington, while Alberta shares its border with Montana. Additionally, there are other provinces that share the border with the U.S. through various territories, but only British Columbia and Alberta have the southern border directly.
Three Canadian provinces share their southern border with the United States from west to east: British Columbia, Alberta, and Saskatchewan. British Columbia is the westernmost province, followed by Alberta and then Saskatchewan. Each province has a border that runs along the US states of Alaska, Montana, and North Dakota, respectively.
Seven of Canada's ten provinces share a common border with the US. They are: British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Québec and New Brunswick. Nova Scotia, Prince Edward Island, and Newfoundland and Labrador do not. In addition, Yukon, one of Canada's three territories, also shares a common border with the US. Northwest Territories and Nunavut do not. Nunavut, however, appears to share a common border with Denmark, because the border runs through Hans Island.
Not just 3, but 7 Canadian provinces border US. - BC, Alberta, Saskatchewan, Manitoba, Ontario, Quebec and New Brunswick
British Columbia, Alberta, Saskatchewan, Manitoba, Ontario and Quebec border the United States.
The seven Canadian provinces that share a border with the the U.S. are British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Quebec and New Brunswick.
British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, and Quebec are the Canadian Provinces that shares their southern border with USA.
Idaho has a border with six US States plus Canada. Oklahoma has a border with six US States. Utah has a border with six US States. Wyoming has a border with six US States.
The western states in the 48 contiguous states that have the longest border with Canada are Washington and Montana. Washington shares a border with British Columbia, while Montana shares a border with Alberta, Saskatchewan, and British Columbia.
About 55 miles