neither, the states don't share a border
No. Montana and California are separate states.
It would so be Montana because the state Montana is bigger.
Montana does not border Mexico.
The California-Nevada state border.
Montana
Montana has a longer border than New York, but Alaska has the longest border.
Montana has a longer border than New York, but Alaska has the longest border.
The largest state by area south of Canada is Texas. The largest state by area adjacent to Canada's southern border is Montana. The largest state by population south of Canada is California. The largest state by population adjacent to Canada's southern border is New York.
The state that borders Montana on the north is Alberta, Canada.
Montana has the longer border of those 2 states with Canada.
North Dakota, South Dakota, Wyoming, and Idaho all share a border with Montana.
In the west, the state of Montana has the longest linear border with Canada. In the east, the state of Michigan has the longest border, including the Great Lakes.