What state borders with Toronto Canada?

Answer 1

NY

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Note: The above answer, that the State of New York shares a border with the City of Toronto, is correct.

The eastern and western borders of the City of Toronto extend southward into Lake Ontario all the way to the International Boundary. Therefore, the southern border of the City of Toronto is the northern boundary of the State of New York, which is also the International Boundary.

Answer 2

most people & indeed most authorities including the international boundary commission itself would say Alaska

yet because parts of the international border in New Hampshire & Maine have never been straightened by artificial means but still legally follow all the tiny sinuosities of natural watercourses & watershed divides

technically the lengths of these border sectors are indeterminate

because they increase in length the shorter the measuring unit used to measure them

to the point of infinity if the unit is tiny enough & thus precisely true enough

so it is a tie between New Hampshire & Maine at infinity if you use a short enough ruler & prefer the absolute truth to conventional beliefs

but otherwise stick with Alaska