Border or Border on?
Hello! Could you please answer if I need to use preposition "on" after the verb "border"? For example: Canada borders the USA OR Canada borders on the USA? Or both variants are possible?

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I would say either: "Canada shares a border with the USA". Or "Canada shares its border with the USA".

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Both answers sound pretty natural to me. "Canada borders the U.S." is probably the best, though, because it sounds a bit more natural.

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Thank you so much!

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@Ben Corey: "borders on" is probably too generous as applies to Mr. Trump. :D

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As a native English speaker, to me it sounds more natural to say that Canada "borders" the USA. I tend to use "borders on" to describe when something is close to becoming someway...for example: "Donald Trump borders on insanity." so as to say (more simply), "Donald Trump is 'very close' to being insane."  
"Borders" I would use in a literal sense, whereas "borders on" naturally takes on a more figurative sense (in my mind). I hope that helps!